ohms

When a magnetized iron bar is strongly heated, its magnetic field

becomes weaker

The current with which a transformer is used

must be ac

The volt is the unit of electric

potential difference

An atom consists of a

small positive nucleus surrounded at a distance by electrons.

A solid conductor is one

whose electrons are free to move about

The current in a 20-ohm electric heater operated at 240 V is

12 A

What is the resistance in a 60-W, 12-V light bulb?

2.4 ohms

The primary coil of a transformer has 200 turns and its secondary coil has 40 turns. If the current in the secondary coil is 25 A, the current in the primary coil is

5 A

An electric iron draws a current of 15 A when connected to a 120-V power source. Its resistance is

8 ohms

An object has a positive electric charge whenever

it has a deficiency of electrons.