Volt
V
= E/Q 1 Volt = 1 Joule / 1
Coulomb
1. Calculate
the potential difference across a bulb if 20 C transfers 4 J of electrical
energy.
2. Calculate
the emf across a dynamo if 600 J of energy is transferred by 25 C of charge.
3. A
bulb has a potential difference of 6V across it. Calculate the energy is
transferred by 90 C.
4. A
train motor operates on a potential difference of 25 kV .Calculate the charge
that transfers 800 kJ of electrical
energy.
5. A
torch bulb runs off a cell of emf 1.5V Calculate the energy transferred by a
charge of 0.27 C
6. A
bulb takes a current of 0.25 A. How many Coulombs per second? It transfers 60W
of power. How many Joules per second? Calculate the emf of the supply.
