Advertisements
Advertisements
प्रश्न
An electric current is passed through a metallic wire. The wire gets heated up. Give the reason. Is it possible to melt the wire by passing a heavy current?
उत्तर
The metallic wire gets heated up on passing an electric current through it due to collisions of free electrons and energy is transferred to the positive ions which begin to vibrate more violently, causing to produce heat. It is possible to melt the wire by passing a heavy current. The wire will melt when its temperature due to heating reaches its melting point.
APPEARS IN
संबंधित प्रश्न
Define kilowatt-hour.
Name the S.I. unit of electrical energy. How is it related to Wh?
A resistor of resistance R is connected to an ideal battery. If the value of R is decreased, the power dissipated in the resistor will ______________ .
Define 1 kilowatt hour.
The diagram 31 shows a 3 terminal plug socket.
(i) What is the purpose of the terminal E?
(ii) To which part of the appliance is the terminal E connected?
(iii) To which wire L or N, is the fuse connected and why?
Give two precautious that you would take while putting off an electric switch.
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.
An Electric bulb is marked 100 W, 230 V. What current does it take?
A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the total energy supplied by the battery in 10 minutes.
