MTEL Physics Practice Exam

Category - Physics

A student would like to measure the electric power used by a laptop computer when placed in the low-power mode. Which of the following pairs of meters should be selected for this measurement?
  1. Galvanometer and ammeter.
  2. Galvanometer and ohmmeter.
  3. Voltmeter and ammeter.
  4. Ohmmeter and voltmeter.
Explanation
Correct Response: C. Electric power is calculated by multiplying voltage by current. A voltmeter and an ammeter should be selected to determine the power used since they measure voltage and current, respectively. The galvanometer and ammeter (A) should not be chosen. A galvanometer is essentially a sensitive ammeter, and while it can be converted to a voltmeter by adding a suitable resistor, that information is not included in the response. The galvanometer and ohmmeter (B) will not measure voltage and current since an ohmmeter is used for measuring resistance. The ohmmeter and voltmeter (D) will measure voltage and resistance, respectively.
Was this helpful? Upvote!
Login to contribute your own answer or details

Top questions

Related questions

Most popular on PracticeQuiz