OUTCOME
By the end of the lesson you will be able to describe the heating effects of current flow and calculate the rate of energy (power) lost due to resistance.
Engage
As the current increases in a wire, it heats up. The heating effect increases the resistance of the wire.
Power dissipated through a resistance can be found using P = V2/R or P = I2R
LEARNING TASKS
Explain
Given a 10 ohm resistor, how many joules of energy are used each second when it is connected to a 6 V battery?
What current is flowing through it?
Explore and explain