Areas for Improvement

Question 1

How does the current move in an a.c. current?

Answer 1

In an a.c. current the direction of the current changes regularly

Question 2

How does the current move in an d.c. current?

Answer 2

In an d.c. current the negative charges flow in one direction only

Question 3

What kind of current’s size varies with time?

Answer 3

a.c.

Question 4

When resistors are in parallel, the one letting the highest current through has the (most/least) current

Answer 4

least

Question 5

What are the mains voltage and frequency?

Answer 5

230V and 50Hz

Question 6

What is an electrical current?

Answer 6

An electrical current is the electrical charge transferred per unit time

Question 7

How does lighting work in terms of charge?

Answer 7

The positive charge in the ground is attracted to the negative charge at the bottom of the clouds. The charge ‘jumps’ upward to reach the charge on the cloud causing a lightning strike.

Question 8

Formula for No. of electrons

Answer 8

Total charge/charge per electron