IGCSE Physics (0625) Unit 4 Electricity and magnetism-4.2.2 Current Paper 1

Question

A length of metal wire is used as a resistor in a circuit.

Which change to the wire results in an increase in current in the circuit?

A.  connecting a second identical length of wire in parallel with the original wire 

B.  connecting a second identical length of wire in series with the original wire 

C.  decreasing the thickness of the wire

D.  increasing the length of the wire

Answer/Explanation

Ans: A

Question

The circuit diagram shows a cell connected to an ammeter and two resistors.

What is the current in the circuit?

A 0.75 A               B 1.3 A                C 12 A                 D 48 A

Answer/Explanation

         Ans: A

Question

Which particles move in a metal to cause an electric current?

  1. electrons

  2. neutrons

  3. nucleons

  4. protons

Answer/Explanation

Ans: A

Question

The circuit shows a 2.0 Ω resistor and a 1.0 Ω  resistor connected to a 12 V battery.

                       

What is the current in the 2.0 Ω resistor?

A 4.0 A

B 6.0 A

C 24 A

D 36 A

Answer/Explanation

Ans: A

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