Which of the following statements are not true of a moving-coil milliammeter? I. It can...

WAEC 1995

Which of the following statements are not true of a moving-coil milliammeter? I. It can be used to measure alternating current II. It has a linear scale III. It can be adapted to read higher values of currents IV. A resistor connected in parallel with the milliammeter would convert it to a voltmeter

A. I and IV only
B. II and III only
C. III and IV only
D. I, II and III only
E. I, III and IV only

Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Correct Answer: Option A

Explanation

Converting an ammeter to a voltmeter involves increasing the resistance of theammeter. This is done by adding a high resistance in series with the ammeter. Also, A moving coil meter indicates the average (mean) of a varying current through it, which is zero for AC. For this reason moving-coil meters are only usable directly for DC, not AC. Hence, I and IV are false.

Previous Next

Go back to Phy classroom

Report an Error Ask A Question Download App