Advertisements
Advertisements
प्रश्न
The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A.
What is the resistance of the lamp?
What is the power of the lamp?
उत्तर
Given:
Potential difference = reading of the voltmeter, V = 3 V
Current in the circuit = reading of the ammeter, I= 0.5 A
(i) Resistance of the lamp, `R=V/I=(3V)/0.54=6 ohm`
(ii) Power, P = VI = 3 V x 0.5 A = 1.5 W
APPEARS IN
संबंधित प्रश्न
Which of the following terms does not represent electrical power in a circuit?
An electric motor takes 5 amperes current form a 220 volt supply line. Calculate the power of the motor and electric energy consumed by it in 2 hours.
An electric bulb is rated 250 W, 230 V. Calculate:
- the energy consumed in one hour
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
An electric bulb marked 220 V, 100 W will get fused if it is made to consume 150 W or more. What voltage fluctuation will the bulb withstand?
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Held at rest inside the coil?
(iii) Pulled out again?
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
An electric appliance is rated at 1000 W, 250V. Calculate:
(i) The electrical energy consumed by the appliance in 12 hour.
(ii) The cost of energy consumed at Rs. 1.20 per kWh.
How long would this appliance take to use 1 kWh energy when operated at 250 V?
1 kWh = ____________
