Calibration of ammeter and voltmeter by potentiometer

1) 5 volts is applied to 2-ohm resistor in series, the resulting current is ?
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2) In a circuit, the current is directly proportional to __________?
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3) SI unit of potential gradient ?
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4) An ammeter is connected to the circuit in ?
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5) Five 10-ohm resistor connected in parallel then its equivalents resistor will be ?
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