Practice Quiz

Praxis II General Science

Category - Physics

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Jack accidentally short-circuited his 12V battery, which has an internal resistance of 0.5 Ohms. At what rate is heat energy released from the short circuit?
  1. 12 watts
  2. 48 watts
  3. 72 watts
  4. 180 watts
  5. 288 watts
Explanation
Answer: E - 288 watts of heat will be released until the battery runs out of power. We can calculate the current flow first, with V = IR, and I = V/R. Thus, I = 24 amps. Wattage of a battery is equal to I * V. Thus, 24 *12 = 288 watts produced. As you can imagine, this amount of heat being released in a small area can be quite dangerous!
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