How many joules of electrical energy are transferred per second by a 6V, 0.5A lamp?

The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when: (a) a charge of 1C passes through it? (b) a charge of 5C passes through it? (c) a current of 2A flows through it for 10s?

How many joules are there in MeV?

Prakash bought an electric bulb which is rated as 70 W . He knows the fact that a 70 W bulb consumes 70 joules of electrical energy per second . The energy consumed by it per second is "______" ergs.

In a refrigerator, heat from inside at 270 K is transferred to a room at 300 K . How many joule of heat energy is drawn from the sink for each joule of electrical energy consumed ideally ?

5% of the energy supplied to a lamp is radiated as a visible light. How many quanta of light are emitted per second by 100 watt lamp ? Assume the average wavelength of visible light at 555 nm

An electric lamp of 100 cd consumes 0.5 watt of electrical energy per candela. Calculate the efficiency of this lamp if the mechaniacal equivalent of ligt, is 0.00161 watt per lumen.

An electric fan runs from the 230V mains. The current flowing through it is 0.4A. At what rate is electrical energy transferred by the fan?

1 unit electrical energy means 1000 joule electrical energy.