Electrical Device

While reading about the heating effect of current, Raju list some electrical devices that work on that principle. He lists some devices . His father notices that one device is listed incorrectly. Electrical device: Electric kettle, Motor, Toaster, Geyser, Hair dryer Which device is listed incorrectly by Raju ?

Microphone is an electrical device that is used to amplify a human voice to be heard at a distance. It consists of a thin membrane called diaphragm that ….i… in response to …ii…… The information in which alternative completes the given statement?

A person buys two electrical devices P and Q for lighting purposes in his house. The device P consumes only 5 units of electricity in a month but device Q consumes 15 units of electricity in a month when used for the same number of hours daily. The device Q wastes a lot of electricity by radiating energy C but P does not do so. (a) What type of device is (i) P, and (ii) Q ? (b) Name one component which is present in Q but not in P. (c) Name the energy C. (d) Which device is more energy efficient : P or Q ? (e) Which fossil fuel is most likely to be conserved if all of us switch over to devices like P ?

To measure the current in an electric device

An electric device which convers chemical energy into electrical energy is "________" .

In our house all electric devices operate on 220 V. It implies that

Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used.

Is there any standard in India based on which one can rely to buy any electric device. If so, what is it ?