P5 - Electricity and Magnetism - REVISION

Graph represents two conductors with different value of resistance. Resistance of A is _________________ than B.

• Higher

• Lower

What is the resistance in this circuit?

• 0.05Ω

• 1.8Ω

• 20Ω

What is the resistance of an object that draws 0.24 A when connected to a 120 V circuit?

• 0.024 Ω

• 28.8 Ω

• 124 Ω

• 500 Ω

What is the current drawn by a 10 Ω resistor when it is connected to a 12 V car battery?

• 22 amperes

• 1.2 amperes

• 0.83 amperes

• 120 amperes

Two balloons, X and Y, are suspended by insulating threads. They are each held near a negatively charged balloon. The balloons hang as shown.

• A

• B

• C

• D

What is the unit of electromotive force?

• amperes

• newtons

• ohms

• volts

What is the unit of electrical power?

• amperes

• joules

• volts

• watts

Which of the above diagrams shows the magnetic field lines around the north pole of a magnet?

• A

• B

• C

• D

When magnets and metal bars are close together they experience forces.

Which row gives the correct description of the effect between these materials?

• A

• B

• C

• D

Some magnets are easily magnetised when placed in a magnetic field, and then quickly lose their magnetism once the field is removed. These materials are used in electromagnets, and are called...

• soft magnetic materials

• hard magnetic materials

• temporary magnets

• partial magnets