Electricity -resistance

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)