not just described, Explained


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Summary of Electricity Explained

1: Electrical Energy

Electrical energy conversion in a washing machine

Electricity is important because we can use it to make so many things work.  That's why we talk about electrical energy.  MORE

2. Inside Circuits

Energy flows in a simple electric circuit

We're going to try and picture what goes on inside an electric circuit.  The little black blobs are charges.  MORE

3. Atoms and Charge

Magnified view of electrons in the wires of an electric circuit

We'll see that the things that are really flowing inside the wires of electric circuits are called electrons.  MORE

4: Complete Circuits

Movement of ions when an electric current flows in a liquid

For a circuit to work there must be a complete conducting path from one terminal of the battery to the other.  MORE

5. Voltage and Current

Using a voltmeter to measure the p.d . across a bulb

We're going to see what voltage and current mean and how they can be measured.  MORE

6. Electrical Power

Graphic of the watt as the unit of power

In the first lesson we saw that a bulb is brighter if energy is converted more quickly in it.  MORE

7: Resistance & Ohm's law

Graphs of current vs voltage for a filament bulb and a resistor

We're going to find out what happens to the current through a component as the voltage across it changes.  MORE

8. Parallel Circuits

Connecting bulbs in parallel to show the increase in current drawn from the battery

We'll see why parallel circuits are so common.  We'll also look at voltage, current, power and effective resistance.  MORE

9. Series Circuits

How voltage changes when a variable resistor is connected in series

If bulbs are connected in series then there are two problems.  The first is that both bulbs are dim.  MORE

10: Domestic Electricity

How household electrical appliances are connected in parallel with each other

We’ll look at AC and DC, plugs, earth wires and fuses, and paying for electricity.  MORE



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