Current Electricity - Ohms Law
Q. If a 10Ω resistor carries a current of 5A, what is the voltage across the resistor? (2023)
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 resistance of 12Ω and a current of 3A, what is the power consumed in the circuit? (2022)
A.
36W
B.
24W
C.
12W
D.
9W
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Solution
Power (P) can be calculated using the formula P = I^2 * R = (3A)^2 * 12Ω = 36W.
Correct Answer: A — 36W
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Q. If the resistance of a conductor is doubled while the voltage remains constant, what happens to the current? (2020)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to Ohm's Law, if the resistance (R) is doubled and the voltage (V) remains constant, the current (I) will be halved (I = V/R).
Correct Answer: B — It halves
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Q. In a circuit with a voltage of 24V and a current of 6A, what is the resistance? (2020)
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Solution
Using Ohm's Law, R = V/I = 24V / 6A = 4Ω.
Correct Answer: D — 8Ω
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Q. What happens to the current in a circuit if the voltage is increased while the resistance remains constant? (2021)
A.
The current decreases
B.
The current increases
C.
The current remains the same
D.
The current becomes zero
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Solution
According to Ohm's Law, if the voltage (V) increases while resistance (R) remains constant, the current (I) will increase.
Correct Answer: B — The current increases
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Q. What is the relationship between voltage, current, and resistance as stated by Ohm's Law? (2021)
A.
V = I + R
B.
V = I * R
C.
V = I / R
D.
V = R / I
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Solution
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the resistance (R) being the constant of proportionality. Therefore, V = I * R.
Correct Answer: B — V = I * R
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Q. Which of the following materials is considered a good conductor of electricity? (2022)
A.
Rubber
B.
Copper
C.
Wood
D.
Glass
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Solution
Copper is a good conductor of electricity due to its low resistance and high conductivity.
Correct Answer: B — Copper
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Q. Which of the following statements is true according to Ohm's Law? (2019)
A.
Resistance is independent of temperature
B.
Voltage is inversely proportional to current
C.
Current is directly proportional to voltage
D.
Resistance increases with increasing current
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Solution
According to Ohm's Law, current (I) is directly proportional to voltage (V) when resistance (R) is constant.
Correct Answer: C — Current is directly proportional to voltage
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