6.2.3 Domestic uses and safety

Question 1

Mains electricity is an ?

Answer 1

ac supply

Question 2

In the United Kingdom the
domestic electricity supply has a frequency of?

Answer 2

50 Hz and is about
230 V

Question 3

what is a direct current?

Answer 3

electrons only flow in one direction
current from a cell is dc which means it only moves in one direction

Question 4

in alternating current?

Answer 4

the current is constantly changing direction

Question 5

adding resistors in series

Answer 5

increases the total resistance. This is because the current is the same in every single component in the circuit, so the more resistors we add, the harder it is for the current to flow. This means that the overall resistance has increased in a series circuit.

Question 6

adding resistors in parallel

Answer 6

decreases the total resistance as more components are added, because there are more paths for the current to pass through