A student wishes to measure the potential difference across a resistor,R. She has a galvanometer,G and some connecting wires. What else does she need?

Assessment: WAEC SSCE - Physics - 2021 (Objective) Subject: Physics

Question 1 Report

A student wishes to measure the potential difference across a resistor,R. She has a galvanometer,G and some connecting wires.

What else does she need?
 

Answer Details
To measure the potential difference across a resistor using a galvanometer, the student needs a high value resistor connected in series with the galvanometer. The high value resistor acts as a voltage divider, allowing the galvanometer to measure the potential difference without being damaged by excessive current. This is known as a voltmeter circuit, and it is commonly used in electronics to measure voltage. A low value resistor connected in parallel with the galvanometer would be used to measure current, not voltage.
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