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If a 12V battery is connected across a 4 ohm resistor, what is the power dissipa

Practice Questions

Q1
If a 12V battery is connected across a 4 ohm resistor, what is the power dissipated in the resistor?
  1. 12 W
  2. 24 W
  3. 36 W
  4. 48 W

Questions & Step-by-Step Solutions

If a 12V battery is connected across a 4 ohm resistor, what is the power dissipated in the resistor?
Correct Answer: 36 W
  • Step 1: Identify the voltage (V) of the battery, which is 12 volts.
  • Step 2: Identify the resistance (R) of the resistor, which is 4 ohms.
  • Step 3: Use the formula for power (P) which is P = V^2 / R.
  • Step 4: Substitute the values into the formula: P = (12V)^2 / 4Ω.
  • Step 5: Calculate (12V)^2, which is 144.
  • Step 6: Divide 144 by 4Ω to find the power: 144 / 4 = 36.
  • Step 7: Conclude that the power dissipated in the resistor is 36 watts.
  • Ohm's Law and Power Calculation – Understanding the relationship between voltage, resistance, and power in electrical circuits.
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