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Q 1/21
Score 0
Why is the current provided by a cell called a direct current (d.c.)?
60
flows directly from the mains socket
flows alternately in different directions
flows from a chemical energy store
only flows in one direction
Q 2/21
Score 0
What is an alternating current (a.c.)?
60
flows and stops repeatedly in the circuit
current that repeatedly reverses direction
the current flows backwards around the circuit
current supplied by an alternative energy resource
21 questions
Q.
Why is the current provided by a cell called a direct current (d.c.)?
1
60 sec
Q.
What is an alternating current (a.c.)?
2
60 sec
Q.
What kind of current is supplied by mains electricity?
3
60 sec
Q.
4
60 sec
Q.
What colour is the live wire in a three-core cable?
5
60 sec
Q.
What colour is the neutral wire in a three-core cable?
6
60 sec
Q.
What colour is the earth wire in a three-core cable?
7
60 sec
Q.
What is the function of the live wire in a three-core cable?
8
60 sec
Q.
What is the function of the neutral wire in a three-core cable?
9
60 sec
Q.
What is the function of the earth wire in a three-core cable?
10
60 sec
Q.
When is there a current in the earth wire?
11
60 sec
Q.
Why is the live wire dangerous?
12
60 sec
Q.
What is the nationwide network of cables and transformers that link power stations to customers called?
13
60 sec
Q.
Transformers can be step-up or step-down.
Which type of transformer increases the current from the power station to the transmission cables?
14
60 sec
Q.
Transformers can be step-up or step-down.
Which type of transformer decreases the p.d. from the transmission cables to the mains supply in buildings so that it is safe to use?
15
60 sec
Q.
How does having a small current in the transmission cables help to make the National Grid an efficient way to transfer energy?
16
60 sec
Q.
What two things does energy transfer to an appliance depend on?
