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WorksheetsElectricity -resistance
Total questions: 33
Worksheet time: 1hrs 6mins
What is electrical resistance?
the rate of flow of electric charge
a measure of the opposition to the flow of charge
the amount of energy transferred per unit of charge
What unit is electrical resistance measured in?
amps (A)
ohms (Ω)
volts (V)
A student's hypothesis is that the length of a wire affects resistance. Which idea would be the most suitable way to test this hypothesis using the apparatus shown?
Change the length of the wire and see how that affects the brightness of a bulb in the circuit.
Change the length of the wire and see how that affects the resistance of the wire.
Change the material of the wire and see how that affects the resistance of the wire.
What is the independent variable (the one thing you change in an experiment) in this investigation?
length of the wire
resistance of the wire
material of the wire
What is the dependent variable ( the thing that you measure in an experiment) in this investigation?
length of the wire
resistance of the wire
material of the wire
In this investigation, the independent variable is length of the wire. Which range and interval would be most suitable to investigate?
10–20 cm with 5 cm intervals
10–100 cm with 10 cm intervals
10–20 cm with 2 cm intervals
Which cell contains an anomalous result ( a result that does not fit the pattern)?
A
B
C
What would be the most suitable way to present the data shown in the table?
bar chart
line graph
pie chart
Which variable should you plot on the x-axis of your line graph?
length of the wire (cm)
resistance of the wire (Ω)
Which variable should you plot on the y-axis of your line graph?
length of the wire (cm)
resistance of the wire (Ω)
Which axis shows the most suitable scale to use on the y-axis of your line graph?
A
B
C
Which graph has the line of best fit correctly drawn?
A
B
C
Calculate the mean resistance (Ω) when the length of the wire was 20 cm.
Don't include units in your answer. Give your answer to the same number of decimal places as the other values in the table.
2.42
1.03
1.93
4
Calculate the mean resistance (Ω) when the length of the wire was 20 cm.
Don't include units in your answer. Give your answer to the same number of decimal places as the other values in the table.
2.42
1.03
1.93
4
Calculate the mean resistance (Ω) when the length was 60 cm.
Don't include units in your answer. Give your answer to the same number of decimal places as the other values in the table.
7.22
3.09
4.02
9.27
Which data point doesn't fit the pattern of the other results?
A
B
C
Do the results in the graph support the student's hypothesis? Explain your answer.
Select yes or no and an explanation.
yes
no
Changing the length of the wire didn't change the resistance of the wire.
Changing the length of the wire changed the resistance of the wire.
The scientific symbol for resistance is _____.
R
r
v
A
Different materials have different resistances. It's easy for a current to flow through an electrical conductor, such as copper, because it has . . .
a high resistance
a low resistance
Different materials have different resistances. It's difficult for a current to flow through an electrical insulator, such as plastic, because it has . . .
a high resistance
a low resistance
The equation for calculating resistance in a circuit is R = V ÷ I. What does the V represent in this equation?
voltage
current
resistance
The equation for calculating resistance in a circuit is R = V ÷ I. What does the I represent in this equation?
voltage
current
resistance
potential difference
A current of 3.0 A flows through a 12 V lamp. What is the resistance of the lamp in ohms?
4
15
0.25
36
A current of 2.0 A flows through a 10 V motor. What is the resistance of the motor in ohms?
20
0.20
12
5
A current of 3.0 A flows through a 230 V lamp. What is the resistance of the lamp in ohms?
77
233
690
0.013
A current of 1.5 A flows through a 230 V resistor. What is the resistance of the resistor in ohms?
153
245.5
0.006
345
A current of 10 A flows through a 23 Ω resistor. What is the voltage across the resistor in volts?
230
0.43
5
33
A current of 3.0 A flows through a 15 Ω motor. What is the voltage across the motor in volts?
5
45
0.2
18
Select the equation for calculating current.
current = voltage ÷ resistance
current = resistance ÷ voltage
current = voltage × resistance
A 2.0 V lamp has a resistance of 15 Ω. What is the current through the lamp in amps?
0.13
17
7.5
30
A 230 V lamp has a resistance of 10 Ω. What is the current through the lamp in amps?
0.043
23
240
2300
Select the equation for calculating voltage.
voltage = current ÷ resistance
voltage = resistance ÷ current
voltage = current × resistance
A 3.0 V lamp has a resistance of 30 Ω. What is the current through the lamp in amps?
10
90
0.1
