Advertisements
Advertisements
Question
Advertisements
Solution
Watt-hour is the commercial unit of electrical energy.
One watt-hour is the electrical energy consumed by an electrical appliance of power 1 watt when it is used for 1 hour.
1Wh = 3600 J
APPEARS IN
RELATED QUESTIONS
One coulomb charge is equivalent to the charge contained in:
(a) 2.6 × 1019 electrons
(b) 6.2 × 1019 electrons
(c) 2.65 × 1018 electrons
(d) 6.25 × 1018 electrons
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.
The following table shows the current in Amperes and potential differences in Volts.
- Find the average resistance.
- What will be the nature of the graph between the current and potential difference? (Do not draw a graph.)
- Which law will the graph prove? Explain the law.
| V (volts) | I (amp) |
| 4 | 9 |
| 5 | 11.25 |
| 6 | 13.5 |
An electric current flowing in a wire creates ______ around the wire.
What would be the danger involved in replacing a blown fuse with the one which would carry a large current?
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
How should the electric lamps in a building be connected?
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
