Current Electricity
Q. If a circuit has a total resistance of 10Ω and a current of 1.5A, what is the voltage supplied by the battery?
A.
15V
B.
10V
C.
5V
D.
20V
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Solution
Using Ohm's Law, V = I * R = 1.5A * 10Ω = 15V.
Correct Answer: A — 15V
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Q. If a circuit has a total resistance of 10Ω and a current of 2A flowing through it, what is the total voltage supplied by the battery?
A.
5V
B.
10V
C.
15V
D.
20V
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Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. If a circuit has a total resistance of 10Ω and a current of 2A flowing through it, what is the voltage across the circuit?
A.
5V
B.
10V
C.
20V
D.
15V
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Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: C — 20V
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Q. If a circuit has a total resistance of 10Ω and a current of 2A, what is the total voltage supplied by the battery?
A.
10V
B.
20V
C.
30V
D.
40V
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Solution
Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 20V
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Q. If a circuit has a total resistance of 10Ω and a current of 3A, what is the total voltage supplied by the battery?
A.
10V
B.
20V
C.
30V
D.
40V
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Solution
Using Ohm's Law, V = I * R = 3A * 10Ω = 30V.
Correct Answer: C — 30V
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Q. If a circuit has a total resistance of 10Ω and a current of 5A, what is the total voltage supplied by the battery?
A.
10V
B.
20V
C.
30V
D.
50V
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Solution
Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.
Correct Answer: B — 20V
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Q. If a circuit has a total resistance of 12 ohms and a current of 3A flows through it, what is the voltage across the circuit?
A.
24V
B.
36V
C.
12V
D.
18V
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Solution
Using Ohm's law, V = I * R = 3A * 12 ohms = 36V.
Correct Answer: B — 36V
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Q. If a circuit has a total resistance of 12Ω and a current of 1.5A flowing through it, what is the total voltage supplied by the battery?
A.
18V
B.
12V
C.
6V
D.
9V
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Solution
Using Ohm's Law, V = I * R = 1.5A * 12Ω = 18V.
Correct Answer: A — 18V
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Q. If a circuit has a total resistance of 12Ω and a current of 1.5A flows through it, what is the total voltage supplied by the battery?
A.
18V
B.
12V
C.
6V
D.
24V
Show solution
Solution
Using Ohm's Law, V = I * R = 1.5A * 12Ω = 18V.
Correct Answer: A — 18V
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Q. If a circuit has a total resistance of 12Ω and a current of 3A, what is the voltage supplied by the battery?
A.
36V
B.
24V
C.
12V
D.
9V
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Solution
Using Ohm's Law, V = I * R = 3A * 12Ω = 36V.
Correct Answer: A — 36V
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Q. If a circuit has a total resistance of 5Ω and a current of 3A flows through it, what is the voltage across the circuit?
A.
10V
B.
15V
C.
20V
D.
25V
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Solution
Using Ohm's law, V = I * R = 3A * 5Ω = 15V.
Correct Answer: B — 15V
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Q. If a circuit has a total resistance of 5Ω and a current of 3A, what is the voltage across the circuit?
A.
10V
B.
15V
C.
5V
D.
20V
Show solution
Solution
Using Ohm's law, V = I * R = 3A * 5Ω = 15V.
Correct Answer: B — 15V
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Q. If a circuit has a total voltage of 10V and a total current of 2A, what is the total resistance in the circuit?
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
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Solution
Using Ohm's Law (R = V/I), total resistance R = 10V/2A = 5Ω.
Correct Answer: A — 5Ω
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Q. If a circuit has a total voltage of 24V and two resistors of 6Ω and 3Ω in series, what is the current flowing through the circuit?
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Solution
Total resistance R_total = 6Ω + 3Ω = 9Ω. Current I = V/R = 24V / 9Ω = 2.67A.
Correct Answer: B — 3A
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Q. If a circuit has a total voltage of 24V and two resistors of 8Ω and 4Ω in series, what is the current flowing through the circuit?
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Solution
Total resistance R_total = 8Ω + 4Ω = 12Ω. Using Ohm's law, I = V/R = 24V/12Ω = 2A.
Correct Answer: B — 2A
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Q. If a circuit has a total voltage of 30V and a total resistance of 15Ω, what is the total current in the circuit?
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Solution
Using Ohm's law, I = V/R = 30V/15Ω = 2A.
Correct Answer: C — 3A
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Q. If a circuit has a voltage of 24 volts and a current of 6 amperes, what is the resistance?
A.
4 Ω
B.
6 Ω
C.
8 Ω
D.
12 Ω
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Solution
Using Ohm's Law, R = V / I = 24 V / 6 A = 4 Ω.
Correct Answer: C — 8 Ω
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Q. If a circuit has a voltage of 30V and a total resistance of 10Ω, what is the total current flowing through the circuit?
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Solution
Using Ohm's law, I = V/R = 30V/10Ω = 3A.
Correct Answer: C — 4A
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Q. If a circuit has two branches with resistances of 4Ω and 8Ω, what is the total current if the voltage across the branches is 12V?
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Solution
For the 4Ω branch, I1 = V/R1 = 12V / 4Ω = 3A. For the 8Ω branch, I2 = V/R2 = 12V / 8Ω = 1.5A. Total current = I1 + I2 = 3A + 1.5A = 4.5A.
Correct Answer: B — 2A
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Q. If a current of 2 A flows through a resistor of 5 ohms, what is the voltage across the resistor?
A.
5 V
B.
10 V
C.
15 V
D.
20 V
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Solution
Using Ohm's law, V = I * R = 2 A * 5 ohms = 10 V.
Correct Answer: B — 10 V
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Q. If a current of 3 A flows through a resistor of 5 ohms, what is the voltage across the resistor?
A.
15 V
B.
10 V
C.
5 V
D.
20 V
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Solution
Using Ohm's law, V = I * R = 3 A * 5 ohms = 15 V.
Correct Answer: A — 15 V
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Q. If a galvanometer shows a deflection when connected to a potentiometer, what does it indicate?
A.
The circuit is open.
B.
The potential difference is zero.
C.
The potential difference is equal to the reference voltage.
D.
The current is flowing through the galvanometer.
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Solution
A deflection in the galvanometer indicates that the potential difference across the galvanometer is equal to the reference voltage.
Correct Answer: C — The potential difference is equal to the reference voltage.
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Q. If a potentiometer is used to compare two cells, what is the effect of increasing the length of the wire?
A.
It increases the accuracy of the measurement
B.
It decreases the accuracy of the measurement
C.
It has no effect on the measurement
D.
It makes the cells equal
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Solution
Increasing the length of the wire increases the potential gradient, which can improve the accuracy of the measurement by allowing for finer adjustments.
Correct Answer: A — It increases the accuracy of the measurement
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Q. If a potentiometer is used to compare two emfs, what is the key requirement for the two circuits?
A.
They must have the same resistance
B.
They must have the same length of wire
C.
They must be connected in series
D.
They must have the same potential gradient
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Solution
For accurate comparison of two emfs using a potentiometer, both circuits must have the same potential gradient to ensure that the readings are directly comparable.
Correct Answer: D — They must have the same potential gradient
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Q. If a potentiometer is used to measure a voltage of 12 V and the length of the wire used is 6 m, what is the potential gradient?
A.
2 V/m
B.
4 V/m
C.
6 V/m
D.
8 V/m
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Solution
The potential gradient is calculated as the potential difference divided by the length of the wire: 12 V / 6 m = 2 V/m.
Correct Answer: A — 2 V/m
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Q. If a potentiometer is used to measure the EMF of a cell and the balance point is found at 3 m, what can be inferred about the cell's EMF if the potential gradient is 1.5 V/m?
A.
1.5 V
B.
3 V
C.
4.5 V
D.
6 V
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Solution
The EMF of the cell can be calculated as EMF = potential gradient × length = 1.5 V/m × 3 m = 4.5 V.
Correct Answer: C — 4.5 V
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Q. If a potentiometer is used to measure the potential difference across a resistor, what must be true about the circuit?
A.
The resistor must be in series with the potentiometer.
B.
The potentiometer must be connected in parallel with the resistor.
C.
The potentiometer must be connected in series with the power supply.
D.
The resistor must be short-circuited.
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Solution
To measure the potential difference across a resistor, the potentiometer must be connected in parallel with the resistor.
Correct Answer: B — The potentiometer must be connected in parallel with the resistor.
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Q. If a potentiometer wire has a potential difference of 12 V and a length of 6 m, what is the potential gradient?
A.
2 V/m
B.
1 V/m
C.
0.5 V/m
D.
3 V/m
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Solution
The potential gradient is calculated as the potential difference divided by the length of the wire: 12 V / 6 m = 2 V/m.
Correct Answer: A — 2 V/m
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Q. If a potentiometer wire has a potential difference of 12V across it and is 4m long, what is the potential gradient?
A.
3 V/m
B.
4 V/m
C.
2 V/m
D.
1 V/m
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Solution
The potential gradient is calculated as V/L = 12V/4m = 3 V/m.
Correct Answer: A — 3 V/m
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Q. If a potentiometer wire has a resistance of 10 ohms and a current of 0.5 A flows through it, what is the potential difference across the wire?
A.
2.5 V
B.
5 V
C.
10 V
D.
15 V
Show solution
Solution
Using Ohm's law, V = IR = 0.5 A * 10 ohms = 5 V.
Correct Answer: B — 5 V
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