Current Electricity
Q. What is the total current flowing through a circuit if the total voltage is 12 V and the total resistance is 4 ohms?
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A.
3 A
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B.
4 A
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C.
12 A
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D.
48 A
Solution
Using Ohm's Law, I = V / R. Here, I = 12 V / 4 ohms = 3 A.
Correct Answer: A — 3 A
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Q. What is the total current flowing through a circuit if the total voltage is 12V and the total resistance is 4Ω?
Solution
Using Ohm's Law (I = V/R), the current is I = 12V / 4Ω = 3A.
Correct Answer: B — 3A
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Q. What is the total current flowing through a circuit if the total voltage is 24V and the total resistance is 6Ω?
Solution
Using Ohm's Law, I = V/R = 24V / 6Ω = 4A.
Correct Answer: B — 4A
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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in parallel?
Solution
Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5Ω. Total current I = V/R_eq = 10V/2.5Ω = 4A.
Correct Answer: B — 2A
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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in series?
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A.
0.5A
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B.
1A
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C.
2A
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D.
5A
Solution
Total resistance R = R1 + R2 = 5Ω + 5Ω = 10Ω. Using Ohm's law, I = V/R = 10V/10Ω = 1A.
Correct Answer: B — 1A
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Q. What is the total current flowing through a junction where 5A enters and 3A and 2A leave?
Solution
According to Kirchhoff's Current Law, the total current entering a junction equals the total current leaving. Here, 5A = 3A + 2A.
Correct Answer: A — 0A
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Q. What is the total current in a circuit with a 10V battery and two 5 ohm resistors in parallel?
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A.
1 A
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B.
2 A
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C.
3 A
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D.
4 A
Solution
Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5 ohms. Total current I = V/R_eq = 10V / 2.5Ω = 4 A.
Correct Answer: B — 2 A
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Q. What is the total current in a circuit with a 12V battery and a total resistance of 3 ohms?
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A.
4 A
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B.
2 A
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C.
3 A
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D.
1 A
Solution
Using Ohm's law, I = V/R, we have I = 12V / 3 ohms = 4 A.
Correct Answer: A — 4 A
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Q. What is the total current in a circuit with a 12V battery and three 4 ohm resistors connected in series?
Solution
Total resistance R_total = 4 + 4 + 4 = 12 ohms. Current I = V/R_total = 12V / 12 ohms = 1A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 12V battery and three resistors (R1 = 4Ω, R2 = 4Ω, R3 = 4Ω) connected in parallel?
Solution
Total resistance R_eq = 1 / (1/R1 + 1/R2 + 1/R3) = 1 / (1/4 + 1/4 + 1/4) = 1.33Ω. Current I = V / R_eq = 12V / 1.33Ω ≈ 9A.
Correct Answer: B — 4A
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Q. What is the total current in a circuit with a 12V battery and two 4 ohm resistors in series?
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A.
1 A
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B.
2 A
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C.
3 A
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D.
4 A
Solution
Total resistance R = R1 + R2 = 4 + 4 = 8 ohms. Current I = V/R = 12V / 8 ohms = 1.5 A.
Correct Answer: B — 2 A
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Q. What is the total current in a circuit with a 24V battery and three resistors (2Ω, 4Ω, and 6Ω) connected in series?
Solution
Total resistance R = R1 + R2 + R3 = 2Ω + 4Ω + 6Ω = 12Ω. Using Ohm's law, I = V/R = 24V / 12Ω = 2A.
Correct Answer: B — 3A
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Q. What is the total current in a circuit with a 9V battery and a 3Ω resistor?
Solution
Using Ohm's law, I = V/R = 9V/3Ω = 3A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 9V battery and two 3Ω resistors in parallel?
Solution
Total resistance R = 1/(1/3 + 1/3) = 1.5Ω; I = V/R = 9V/1.5Ω = 6A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with two branches, one carrying 2 A and the other 3 A?
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A.
5 A
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B.
6 A
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C.
1 A
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D.
0 A
Solution
In a parallel circuit, the total current is the sum of the currents in each branch: I_total = I1 + I2 = 2 A + 3 A = 5 A.
Correct Answer: A — 5 A
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Q. What is the total power consumed in a circuit with a 12V battery and a 4Ω resistor?
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A.
12W
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B.
24W
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C.
36W
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D.
48W
Solution
Power P = V^2/R = (12V)^2/4Ω = 36W.
Correct Answer: B — 24W
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Q. What is the total power consumed in a circuit with a current of 5A and a total resistance of 4Ω?
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A.
10W
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B.
20W
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C.
30W
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D.
40W
Solution
Power (P) = I^2 * R = 5^2 * 4 = 25 * 4 = 100W.
Correct Answer: D — 40W
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Q. What is the total resistance in a circuit with a 10Ω resistor in series with a 5Ω resistor?
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A.
5Ω
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B.
10Ω
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C.
15Ω
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D.
50Ω
Solution
In series, total resistance (R_total) = R1 + R2 = 10Ω + 5Ω = 15Ω.
Correct Answer: C — 15Ω
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Q. What is the total resistance in a circuit with a 12 ohm and a 4 ohm resistor connected in parallel?
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A.
3 ohms
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B.
4 ohms
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C.
9 ohms
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D.
16 ohms
Solution
1/R_eq = 1/12 + 1/4 => R_eq = 3 ohms.
Correct Answer: A — 3 ohms
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Q. What is the total resistance in a circuit with a 12Ω resistor and a 4Ω resistor connected in series?
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A.
16Ω
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B.
48Ω
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C.
3Ω
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D.
8Ω
Solution
In series, total resistance R_total = R1 + R2 = 12Ω + 4Ω = 16Ω.
Correct Answer: A — 16Ω
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Q. What is the total resistance of a circuit with a 3Ω and a 5Ω resistor in series?
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A.
8Ω
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B.
15Ω
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C.
2Ω
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D.
1.5Ω
Solution
Total resistance R = R1 + R2 = 3Ω + 5Ω = 8Ω.
Correct Answer: A — 8Ω
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Q. What is the total resistance of two 10 ohm resistors connected in parallel?
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A.
5 ohms
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B.
10 ohms
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C.
20 ohms
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D.
15 ohms
Solution
1/R_eq = 1/R1 + 1/R2 = 1/10 + 1/10 = 2/10. Thus, R_eq = 10/2 = 5 ohms.
Correct Answer: A — 5 ohms
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Q. What is the total resistance of two 10 ohm resistors connected in series?
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A.
5 ohms
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B.
10 ohms
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C.
20 ohms
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D.
15 ohms
Solution
In series, R_eq = R1 + R2 = 10 + 10 = 20 ohms.
Correct Answer: C — 20 ohms
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Q. What is the total resistance of two 12 ohm resistors connected in parallel?
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A.
6 ohms
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B.
12 ohms
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C.
24 ohms
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D.
18 ohms
Solution
1/R_eq = 1/R1 + 1/R2 = 1/12 + 1/12 = 2/12. Thus, R_eq = 12/2 = 6 ohms.
Correct Answer: A — 6 ohms
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Q. What is the total resistance of two 8Ω resistors connected in series?
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A.
8Ω
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B.
16Ω
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C.
4Ω
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D.
12Ω
Solution
In series, R_eq = R1 + R2 = 8 + 8 = 16Ω.
Correct Answer: B — 16Ω
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Q. What is the total resistance of two resistors of 5 ohms and 10 ohms connected in parallel?
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A.
3.33 ohms
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B.
5 ohms
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C.
15 ohms
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D.
50 ohms
Solution
1/R_eq = 1/5 + 1/10 => R_eq = 3.33 ohms.
Correct Answer: A — 3.33 ohms
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Q. What is the total resistance of two resistors of 8Ω and 12Ω connected in series?
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A.
20Ω
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B.
24Ω
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C.
16Ω
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D.
18Ω
Solution
In series, R_eq = R1 + R2 = 8 + 12 = 20Ω.
Correct Answer: A — 20Ω
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Q. What is the total voltage across a parallel circuit with two branches, one with 10Ω and 20Ω resistors, if the total current is 3A?
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A.
6V
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B.
9V
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C.
12V
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D.
15V
Solution
Using the formula V = I * R_eq. First, find R_eq = 1 / (1/10 + 1/20) = 6.67Ω. Then, V = 3A * 6.67Ω = 20V.
Correct Answer: C — 12V
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Q. What is the total voltage in a series circuit with a 9V battery and two resistors of 2Ω and 3Ω?
Solution
In a series circuit, the total voltage is equal to the voltage of the battery, which is 9V.
Correct Answer: A — 9V
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Q. What is the unit of electrical resistance?
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A.
Volt
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B.
Ampere
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C.
Ohm
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D.
Watt
Solution
The unit of electrical resistance is Ohm.
Correct Answer: C — Ohm
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