In this section you will learn about the big ideas of Electricity and Magnetism:
- What is an electric field? What is its effect on charges?
- What is the electric force affected by?
- When charges move around a circuit, what can this be used for?
- What do terms like 'current', 'voltage', 'resistance' and 'power' really mean?
- What is a magnet made of?
- How do circuits and charges interact with magnets?
Whe paying an electricity bill you are not being charged for the charge you have received but you are being charged for the ablity to make your charges move.
An easy way to remember Which hand to use is that the left hand rule is applied to motors and motors drive on the left, What do you mean motors don´t drive on the left?
Coulomb´s law is the electrical equivalent of Newton´s universal gravitational law. How luck we are that the universe is so simple. When defining field strength don't forget that the test charge is positive. You don't need to go inside spheres of charge
Graphs are very useful for confirming relationships but remember that resistance is the ratio of V/I not the gradient of a V vs I graph.
Electric force can not be explained without introducing a new quantity charge. You might think that this should be a fundamental quantity but it isn't, the fundamental unit of electricity is current. As with gravitational fields, field lines are used to
I was once given some balloons by the local shop. When I tried to do electrostatics experiments with them they didn't work. They were free of charge.