4ELEC-16
Contents
Outcomes
- Pupils can recall one volt is one joule per coulomb
Specification References
- 2.19 recall that:
voltage is the energy transferred per unit charge passed
the volt is a joule per coulomb.
Starter
Ask pupils to write down on mini white boards all the electricity equations they have come across so far.
and/or ask pupils to wrtie down all of the electrical quantities they have come across so far including their symbol, unit and unit symbol.
Main Body of Lesson
Go through deriving V=E/Q leading to the idea that one volt is a joule per coulomb. You could also revise here that the amp is a coulomb per second and the watt is a joule per second. You can use all three of these definitions to show that P=IV is homogeneous s the coulombs disappear.
If you have a reasonable group you can talk about the electronvolt as a unit for energy.
Can use the rest of the lesson to do some calculation work.
Could do a human circuit with each pupil being a coulomb of charge. Measure how long they take to compelete a circuit to get current. Give each one some energy as they go pass, this is the voltage (and you are the power supply). Have them transfer their energy to another place and you can calculate the power being transferred.
