A galvanometer coil has a resistance of 12 and the metre shows full-scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?
1. | a resistor of resistance 5988 is to be connected in series with the galvanometer. |
2. | a resistor of resistance 4988 is to be connected in parallel with the galvanometer. |
3. | a resistor of resistance 4988 is to be connected in series with the galvanometer. |
4. | a resistor of resistance 5988 is to be connected in parallel with the galvanometer. |
A galvanometer coil has a resistance of 15 Ω and the metre shows full-scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
1. | a shunt resistor 0.02 is to be connected in series with the galvanometer. |
2. | a shunt resistor 0.02 is to be connected in parallel with the galvanometer. |
3. | a shunt resistor 0.01 is to be connected in series with the galvanometer. |
4. | a shunt resistor 0.01 is to be connected in parallel with the galvanometer. |