Question

1 Write the SI unit of electric power.
2 Which bulb has more resistance-a 220 V,100 W bulb or a 220 V, 60 W bulb ?
3 What is commercial unit of energy?
4. What is the SI unit of charge?
5. Why is tungsten exclusively used for making filaments of electric lamps?

6 Name the instrument used for measuring:
a. Potential difference
b. Electric current
7 Define least count with an example.
8 Why are electric bulbs filled with chemically inactive nitrogen or organ gas​

Answer 1

si unit of power is watt.

commercial unit of energy is kilowatt-hour.

si unit of charge iss amphere

Answer 2

si unit of power is watt

For resistance use formula R=v^2/p

si unit of charge is coulomb

Ammeter measures electric current in circuit

voltmeter measures potential sifference