P2.7 Transferring energy
- when there is an electric current in a resistor, there is an energy transfer which heats the reistor. This is a result of collisions between electrons and ions in the lattice.
- advantages of heating effects of an electrical current: this heating is useful in appliances such as electric fires and kettles. These appliances are effectivley large resistors.
-Disadvatages of heating effects of an electrical current: some electrical appliances could create so much waste energy that they becom to hot and may cause burns.
electrical power (watt, w) = current (amperes, A) * potential diffrence ( volt,v)
energy transfered (joules, j) = potential diffrence (volt,v)* time (second, s)