The energy shifted every second in this circuit depends on both the current and the potential difference. In this simple...

Physics Narrative 14-16

Batteries are just about everywhere. Expensive, portable power is something that we are prepared to pay for. Mobile phones...

Physics Narrative 14-16

Controlling the rate at which energy is shifting (the power) has been, and remains, a central concern of technology. Directing...

Physics Narrative 14-16

Even up until the end of the First World War, electric lighting was only enjoyed by rich householders. The advantages over...

Physics Narrative 14-16

We have all seen this slogan, but does it make a difference? And in terms of the science, surely it's those using filament...

Physics Narrative 14-16

Good room heaters warm the particles in a room, so they switch pretty much all of the power from the electrical pathway to a...

Physics Narrative 14-16

Controlling motion by switching from an electrical pathway to a mechanical pathway happens everywhere. Try counting the...

Physics Narrative 14-16

Loudspeakers reproduce sounds by turning the to-and-fro movements of electrical currents, which encode the sound, into the to...

Physics Narrative 14-16

Transformers are devices connecting pathways yet they seem not to switch pathway–one electric circuit is linked to another...

Physics Narrative 14-16

A transformer transforms potential difference. In particular it can step up or step down the potential difference by a...

Physics Narrative 14-16

A coil of current-carrying wire produces a steady magnetic field, just like a bar magnet. Link this magnetic field to a second...

Physics Narrative 14-16

The conservation of energy is a very fundamental principle: the energy shifted from one store is equal to the energy shifted...

Physics Narrative 14-16