What is the power consumed by a 10 ohm resistor when a current of 3 A flows thro

Practice Questions

Q1
What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?
  1. 30 W
  2. 90 W
  3. 60 W
  4. 15 W

Questions & Step-by-Step Solutions

What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?
Correct Answer: 90 W
  • Step 1: Identify the values given in the problem. We have a resistor with a resistance of 10 ohms and a current of 3 A flowing through it.
  • Step 2: Recall the formula for power (P) in terms of current (I) and resistance (R). The formula is P = I^2 * R.
  • Step 3: Substitute the values into the formula. Replace I with 3 A and R with 10 ohms: P = (3 A)^2 * 10 ohms.
  • Step 4: Calculate (3 A)^2. This equals 9 A^2.
  • Step 5: Multiply 9 A^2 by 10 ohms: 9 * 10 = 90.
  • Step 6: Conclude that the power consumed by the resistor is 90 watts (W).
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