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What is alternating current (a.c.), and how does it differ from direct current (d.c.)?
Alternating current (a.c.) is a type of where the of current flow repeatedly, whereas direct current (d.c.) consists of flowing in one direction only.
Words option: electrons; electric current; direction; reverses
Define electric current.
Electric current is the passing per .
Words option: charge; unit time
What is an electromagnet, and how is it created?
An electromagnet is a magnet produced by passing an through a soft wound on a of wire.
Words option: iron core; temporary; electric current; coil
Explain the concept of electromagnetic induction.
Electromagnetic induction is the production of a or is at rest in a across a conductor when it moves through a magnetic field.
Words option: potential difference; magnetic field; voltage; changing
Define electromotive force (e.m.f.).
Electromotive force (e.m.f.) is the electrical by a source in moving a around a complete .
Words option: unit charge; circuit; work done