A person buys two electrical devices P and Q for lightening purposes in his house. The device P consumes only 5 units of electricity in a month but the 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?

A person buys two electrical devices P and Q for lightening purposes i

1.	A person buys two electrical devices P and Q for lightening purposes in his house. The device P consumes only 5 units of electricity in a month but the 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?
Answer» A person buys two electrical devices P and Q for lightening purposes in his house. The device P consumes only 5 units of electricity in a month but the 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?