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If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power con
If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)
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Practice Questions
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If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)
12 W
7 W
3 W
1 W
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Power (P) can be calculated using P = I² × R = (3 A)² × 4 Ω = 12 W.
Questions & Step-by-step Solutions
1 item
Q
Q: If a circuit has a current of 3 A and a resistance of 4 Ω, what is the power consumed? (2020)
Solution:
Power (P) can be calculated using P = I² × R = (3 A)² × 4 Ω = 12 W.
Steps: 6
Show Steps
Step 1: Identify the formula for power (P) in a circuit, which is P = I² × R.
Step 2: Note the given values: current (I) is 3 A and resistance (R) is 4 Ω.
Step 3: Substitute the current value into the formula: P = (3 A)² × 4 Ω.
Step 4: Calculate (3 A)², which is 9 A².
Step 5: Multiply 9 A² by 4 Ω to find the power: 9 A² × 4 Ω = 36 W.
Step 6: The power consumed in the circuit is 36 W.
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