To vary from one extreme to another, generally with a regular interval.
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The SI unit of electric potential or electromotive force.
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Electrical current is the flow of electric charge.
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A force acting between magnets or moving electric charges.
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A safety device used to prevent an overload of current in an electrical circuit.
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An electronic component that allows current to flow in only one direction.
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An electric current in which the flow of electric charge is consistently in one direction.
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An electric current in which the flow of electric charge periodically changes direction.
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A device used to change the voltage of an alternating current.
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A safety device that breaks a circuit when the current exceeds a safe limit.
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A transmitter or receiver that converts alternating electric currents into electromagnetic waves, or vice versa.
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The force experienced by a current-carrying wire when placed within a magnetic field.
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Whether it's a faulty appliance or a bolt of lightning, an electric shock can be fatal. How can we avoid electric shocks? Physics - Electricity And Circuits - Learning Points. If humans become part of an electric circuit they will...

What are circuits and why do we need them? What happens if you break a circuit? Physics - Electricity And Circuits - Learning Points. Circuits are composed of a voltage source and components. The current in a series circuit is the same...

What is resistance? Discover how it impedes electrical flow, and why understanding it can help us to build more effective circuits, and stay safe. Physics - Electricity And Circuits - Learning Points. Resistance is how well or poorly an...

How do electromagnets differ from permanent magnets, and what are they used for? Physics - Electricity And Circuits - Learning Points. An electromagnet is created by running an electrical current through a coil of wire. An electromagnet...

The generation of a voltage in a conductor when placed within a changing magnetic field.
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The story of one young guitarist, who befell the dangers of electricity. Why is electricity dangerous to humans? And is it only voltage which can be deadly? Physics - Electricity And Circuits - Learning Points. An electrical current of...

What is electricity? How is it created, and what makes it useful? Physics - Electricity And Circuits - Learning Points. Electricity is a flow of charge. The flow of moving electrons is known as the electric current. Voltage is the amount...

Discover how doctors use electricity in the human body to stimulate and suppress muscles - and save lives. Physics - Electricity And Circuits - Learning Points. Electricity is a useful tool in medicine and saves lives. An electric shock...

Power loss affects electricity supply, especially to homes far from power stations. Why is power lost, and how is electricity effectively transported over long distances? Physics - Electricity And Circuits - Learning Points. Direct...

The battle between famous 19th century inventors Edison and Tesla for a slice of America's electricity market, and the lengths they went to in order to secure it. Physics - Electricity And Circuits - Learning Points. Thomas Edison...

When will India overtake China as the world's most populous country? Maths - Number A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s math films show abstract concepts in action in the real world.

Electrolysis is fundamental to industrial processes. How was it discovered, how does it work and what are its uses? Chemistry - Reactions - Learning Points. The Chemist Humphry Davy developed the reaction we now call electrolysis....