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Electricity Basics
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1
Question
How can conductors be charged without direct contact?
Answer
By induction.
2
Question
What are conductors used for?
Answer
To make wires that carry electricity.
3
Question
What are insulators used for?
Answer
To cover wires and keep electricity from escaping.
4
Question
What is an electric current?
Answer
The flow of charges through a conductor.
5
Question
What is needed to make a current flow?
Answer
A complete circuit and a power source.
6
Question
What does electromotive force (e.m.f.) represent?
Answer
The force from the battery that pushes current around the circuit.
7
Question
What is potential difference (p.d.)?
Answer
The charge difference that causes current to flow.
8
Question
In which direction does current flow by convention?
Answer
From the positive terminal to the negative terminal.
9
Question
What actually flows in a metal wire?
Answer
Electrons moving from the negative to the positive terminal.
10
Question
What unit measures potential difference and e.m.f.?
Answer
Volts (V).
11
Question
What unit measures electric current?
Answer
Amperes (A).
12
Question
How are circuits represented on paper?
Answer
Using circuit diagrams with symbols.
13
Question
How can circuit components be connected?
Answer
In series or in parallel.
14
Question
What is electrical resistance?
Answer
The opposition to current flow in a circuit.
15
Question
What is the formula for resistance?
Answer
R = V / I.
16
Question
In which units is resistance measured?
Answer
Ohms (Ω).
17
Question
What are two main dangers of electricity?
Answer
Electrocution and fire.
18
Question
How can electrocution be prevented?
Answer
Using insulation and grounding.
19
Question
How can electrical fires be prevented?
Answer
Using fuses and circuit breakers.