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5/17 MCQs for:
ELECTRICITY: Resistance
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery. If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained
A cylindrical piece of a soft, electrically-conducting material has resistance R. It is rolled out so that its length is doubled but its volume stays constant. What is its new resistance?

What current flows in the 12 ohms resistor in the circuit below:

A galvanometer with a coil resistance of 40.0 W deflects full scale for a current of 2.0 mA. What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V?

A p.d. of 12 V is connected between P and Q. What is the p.d. between X and Y?