← Electromagnetic induction

Naming the induced EMF

A magnet slides into a coil. What does the coil's meter show while the magnet moves?

A magnet moves through a coil, and the voltmeter across the coil reads 0.3 V. That 0.3 V is a voltage. But a voltage made this way has a name of its own.

The 0.3 V was generated by electromagnetic induction.

A voltage generated by electromagnetic induction is called an electromotive force, written EMF.

The induced voltage gets a nameWhile the magnetEMF across the coilmoves0.3 Vrests0 V
The generated voltage, the EMF, is 0.3 V while the magnet moves, and 0 V while it rests.

An EMF is a voltage. So an EMF is measured in volts (V), like any voltage.

The old name misleads: an EMF is not a force. It is a voltage.

A voltage generated by electromagnetic induction is called an electromotive force (EMF). An EMF is a voltage, measured in volts (V).

While the magnet moves, there is an EMF of 0.3 V across the coil. When the magnet stops, the EMF is zero.

A meter across a coil reads 0.6 V while a magnet is pushed in. What name does this generated voltage have?

The 0.6 V was generated by electromagnetic induction.

A voltage generated by electromagnetic induction is called an electromotive force (EMF).

The 0.6 V is an EMF.

Which unit does a meter use to measure an EMF?

An EMF is a voltage.

A voltage is measured in volts.

The meter measures the EMF in volts (V).

Which unit is an EMF measured in?

Which of these is an EMF?

A magnet moving in a coil generates a voltage across the coil. What is this generated voltage called?

Your turn

Which pairing of name and meaning is correct?

While a magnet moves through a coil, a voltmeter across the coil reads 0.25 V. Which statement about the 0.25 V is correct?

Which statement about an EMF is correct?