Current Electricity

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Q1. In a circuit with a 10Ω resistor and a 5V battery, what is the power consumed by the resistor? (2023)

Solution:

Power P = V^2/R = 5^2/10 = 25/10 = 2.5W.

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Q2. If a circuit has a total resistance of 12Ω and a current of 2A, what is the voltage across the circuit? (2020)

Solution:

Using Ohm's law, V = I * R = 2A * 12Ω = 24V.

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Q3. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current flowing through the circuit? (2023)

Solution:

Using Ohm's law, I = V/R = 24V/8Ω = 3A.

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Q4. In a series circuit, if the resistance is doubled, what happens to the current flowing through the circuit? (2021)

Solution:

According to Ohm's law, I = V/R. If R is doubled, the current I will be halved for a constant voltage V.

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Q5. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the voltage across the 6Ω resistor? (2022)

Solution:

Total resistance R_total = 3Ω + 6Ω = 9Ω. Current I = V/R_total = 9V/9Ω = 1A. Voltage across 6Ω = I * R = 1A * 6Ω = 6V.

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Q6. A circuit has a 15V battery and a total resistance of 5Ω. What is the total current flowing through the circuit? (2023)

Solution:

Using Ohm's law, I = V/R = 15V/5Ω = 3A.

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Q7. In a series circuit, if one resistor fails, what happens to the current in the circuit? (2019)

Solution:

In a series circuit, if one resistor fails, the circuit is broken and the current stops.

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Q8. If a circuit has a total voltage of 50V and a total resistance of 10Ω, what is the total current flowing through the circuit? (2020)

Solution:

Using Ohm's law, I = V/R = 50V/10Ω = 5A.

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Q9. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the current flowing through the circuit? (2022)

Solution:

Total resistance R = 3Ω + 6Ω = 9Ω. Current I = V/R = 9V/9Ω = 1A.

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Q10. If a circuit has a total voltage of 24V and a total resistance of 6Ω, what is the current flowing through the circuit? (2023)

Solution:

Using Ohm's law, I = V/R = 24V/6Ω = 4A.