QUESTIONS
ANSWER BOX
1 .
What do we call each end of a magnet?
The
poles (North and South).
2.
Which of these materials are magnetic;
copper, paper, iron, glass, steel?
Iron
and steel,
3.
How can you make two magnets repel
each other?
Put
two North poles together or two South poles together.
4.
How can you make an electromagnet?
Connect
a coil of wire to a battery, and pass
electricity
through the coil.
5.
Name 5 uses of electromagnets.
In
scrapyards, electric motors, door bells,
TV
sets and loudspeakers
6.
What things do you need to find a
magnetic field around a magnet?
A
plotting compass or iron filings.
7.
For an electric current to flow we
must have a complete _______with no ________ in it.
circuit,
gaps.
8.
What do we call materials which,
a) let electricity pass through them,
and
b) don't let electricity pass through
them?
b)
insulators.
9.
Draw two circuits to show the
difference between series and parallel circuits. Use one cell and two
bulbs in each circuit.
Series
Parallel:
10.
We think that tiny particles move
through a wire when electric current flows. What are these particles
called?
Electrons.
11.
What happens to a thin piece of wire
when electricity flows through it?
It
heats up.
12.
What do we use to measure the size of
an
An
ammeter.
electric current?
13.
What units do we use when measuring
electric currents?
Amperes
(amps or A).
14.
What do we call the safety devices
used in
A
fuse It breaks (melts) when too much
current
plugs? How does it work?
flows
through it. This breaks the circuit.
15.
What do we use to measure the size of
the 'push' of a battery?
A
voltmeter.
16.
How, do we describe a battery that has
lost all of its 'push' ?
Flat.
17.
Modern houses don't have fuse boxes in
their mains circuits. What do they use instead?
Circuit
breakers.