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.