Practice Quiz

Praxis II General Science

Category - Physics

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Chad has a super powerful battery capable of producing 30,000 volts! However, to use it safely, he needs to make sure the current flowing through isn’t more than 1.5 amps at all times. Which of the following resistors should he use?
  1. 1500 Ohms
  2. 11000 Ohms
  3. 20000 Ohms
  4. 25000 Ohms
  5. 48000 Ohms
Explanation
Answer: C - He should use a resistor with a rating of 20,000 Ohms. This will give the correct rating of 1.5 amps, which actually still isn’t safe! A current of about 50 mA is enough to kill someone, regardless of the voltage.
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