Which of these is a symbol for a thermistor?

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Which of these circuits are parallel circuits?

• X and Y only

• X and Z only

• Y and Z only

• All of them

Which of these statements is not true? Assume that Q and R are the same resistance.

• Which of these statements is not true? Assume that Q and R are the same resistance.

• The current is the same at P and S.

• The current is the same at P and S.

• The current is the same at P and Q.

Dave investigates the current in a lamp. Here is part of his circuit.

Dave uses the variable resistor to change the current. Dave wants to measure the current in the lamp.

He should connect

• a voltmeter in series with the lamp

• a voltmeter in parallel with the lamp

• an ammeter in series with the lamp

• an ammeter in parallel with the lamp

What is a flow of charged particles called?

• Potential difference

• Resistance

• Current

• Voltage

If 25 C of charge transfers 50 J of energy between two points, what is the voltage between those points?

• 2.5 V

• 2.0 V

• 0.5 V

• 5.0 V

What row of the table correctly shows the symbol and unit of charge?

• A

• B

• C

• D

Jane and Kim are investigating how the current in a fixed resistor varies with voltage.

They conduct the investigation once. Here is their first graph.

They conduct the investigation again. The new resistor has a higher resistance. Which of these could be their new graph?

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Elaine and Esther measure the current in different resistors.

They also measure the voltage across each resistor.

These are their results.

• 10.0 A

• 4.00 A

• 0.250 A

• 0.125 A

A 2 Ω and a 3 Ω resistor in series give what total resistance?

• 6.0 Ω

• 5.0 Ω

• 1.5 Ω

• 1.0 Ω