Domestic uses of electrecity P5 Flashcards
1
Q
d.c.
A
current flows in one direction so the graph of p.d over time has to always be positive or negative
2
Q
Full form of d.c
A
direct current
3
Q
Full form of a.c
A
Alternating current
4
Q
What is a source of a d.c?
A
Batter, cell
5
Q
a.c
A
when current continuously changes direction
6
Q
a.c. current goes to ….
A
positive and negative terminal at a very rapid rate
7
Q
How much voltage does the main’s power have
A
230 V
8
Q
What does hertz mean
A
How many times it has changed direction in a second
9
Q
How many hertz does main’s power have
A
50
10
Q
Where does mains electrecity come
A
Come from power station
11
Q
National grid
A
System that transports electrecity
12
Q
Step up transformer… p.d
A
increases
13
Q
Increase p.d means
A
reduced energy loss
14
Q
Why decrease p.d
A
so electricity can get to our houses safely
15
Q
Frequency=
A
1/period
