A student wishes to measure the electromotive force (e.m.f.) of a battery and the potential difference (p.d.) across a resistor.
She has the resistor, the battery and some connecting wires.
What else does she need?
a voltmeter only
2 )
an ammeter only
3 )
an ammeter and a voltmeter
4 )
a force meter (newton meter) and a voltmeter
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