2. If you are not sure of the range of the current in a circuit you are about to

Question

2. If you are not sure of the range of the current in a circuit you are about to measure, you should set the ammeter to (a) its largest range. (b) its smallest range. 3. An ammeter should be connected (a) in series with the power supply and the resistor or light bulk or other devices through whi current is being measured. element through which the current is being measured. 4. A voltmeter should be connected (a) in series with the resistor or light bulk across which the voltage is being measured. (b) in parallel with the circuit element across which the voltage is being measured. ·If the current in a resistor is 5.0 mA and voltage across it is 5.0V, what is its resistance? (a) 1.0 ohm (b) 1000 ohm (c) 0.001 ohm

Explanation / Answer

2. (a) its highest range

reason : to prevent damage to meter the movement from excessive current.

3. (a) in series with the power supply and the register or light bulk or other devices through which current is being measured.

reason : the purpose of the ammeter is to measure the current through the circuit,also the ammeter is a low impedance device, connecting it in parallel with the circuit would cause a short circuit, damaging the ammeter and/or the circuit.

4. (B) in parellel with the circuit element

reason : This is necessary because objects in parallel experience the same potential difference.

5. I= 5mA and V=5v

as we know, V=IR => R=V/I

so R=5/(5x10–3) =1000

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