Current Electricity

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Q1. 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.

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Q2. 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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Q3. 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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Q4. In a circuit with a 15V battery and a 5Ω resistor, what is the voltage drop across the resistor? (2019)

Solution:

The voltage drop across the resistor is equal to the battery voltage, which is 15V.

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Q5. What is the total current in a circuit with a 10Ω resistor and a 5Ω resistor in series connected to a 30V battery? (2021)

Solution:

Total resistance R = 10Ω + 5Ω = 15Ω. Current I = V/R = 30V/15Ω = 2A.

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Q6. If a circuit has a 12V battery and a total resistance of 3Ω, what is the power consumed by the circuit? (2023)

Solution:

Power P = V^2/R = 12^2/3 = 144/3 = 48W.

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Q7. In a circuit, if the voltage is tripled and the resistance remains constant, what happens to the current? (2022)

Solution:

According to Ohm's law, if V is tripled, I will also triple.

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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. If two resistors of 4Ω and 6Ω are connected in parallel, what is the equivalent resistance? (2022)

Solution:

Using the formula for parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/6 = 5/12, R_eq = 12/5 = 2.4Ω.

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Q10. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current? (2020)

Solution:

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