Download Electricity Worksheet 2 – Voltage, Current and Resistance

Electricity Worksheet 2 – Voltage, Current and Resistance
Question 1
Work out the voltages labelled “?” in each of the circuits below.
?V
a)
12V
b)
8V
?V
d)
c)
5V
4V
3V
?V
?V
3V
3V
?V
Question 2
Current A1 = 6A
Current A3 = 4A
a) What is A2 and A4
b) What will happen if A3 is removed?
Question 3
Are the following statements
true or false? Explain why.
a) The current at A is bigger
than the current at E
b) The two lamps are
connected in series
c) Connecting an extra lamp in
position D means that the
voltages across A and B drop.
d) Connecting an extra lamp in
position D means that the
current at A and E goes up.
A4
A1
A2
A
?V
B
A3
A
E
B
C
D
C
Question 4
Work out the currents labelled “?” in each of the circuits below.
a)
b)
2A
?A
c)
5A
?A
?A
?A
4A
2.5A
?A
V
?A
2A
The following formula will be useful for the next questions V = I R
I
Question 5
Use the formula triangle shown to help you work out
the current flowing in the circuit below. Remember to
show all working!
R
Question 6
The circuit below contains 2 identical bulbs.
8V
12V
6W
a) What is the current in this circuit?
b) Which way will the current flow, clockwise or
anticlockwise? (use conventional current, not electron
flow)
c) Another resistor is added and the current drops to
1.5A. What is the total resistance of the circuit now?
A
B
The current through bulb A is 0.5A.
a) What is the total current in the circuit?
b) What is the resistance of bulb A?
c) What is the total resistance of the circuit?