Advertisements
Advertisements
Question
An electric bulb is rated ‘240 V, 100 W’.
- What information can you get from the above statement?
- What will happen if this bulb is connected across 220 V?
- Calculate the resistance of the bulb.
- Also find the energy consumed by the bulb in 10 minutes.
Advertisements
Solution
a. The above statement gives the information that when the electric bulb is put at 240 V of a potential difference it consumes 100 W of power.
b. The bulb will consume less power.
c. R = `"v"^2/"p"`
`= (240 xx 240)/100`
= 576 Ω
d. Electrical energy (kWh) = kW × h
`= 100/100 xx 10/60`
`= 1/60` kWh
APPEARS IN
RELATED QUESTIONS
How does the resistance of a wire depend on its length? Give a reason for your answer.
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
How are the home appliances connected in general, in series or parallel. Give reasons.
The effective resistance of three resistors connected in series is lesser than the lowest of the individual resistances.
What happens to the resistance, as the conductor is made thicker?
The resistance of a straight conductor is independent of ______.
The resistance of a conductor is R. If Its length is doubled, then its new resistance will be ______.
______ is the only non-metal that is a good conductor of electricity.
If the area of cross-section of the conductor is doubled its resistance gets ______.
The ______ is the measure of opposition offered by the component to the flow of electric current through it.
