IGCSE Physics Electricity

Which one is a Fuse?

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What advantage does a circuit-breaker have over a fuse in an electric circuit?

• A circuit-breaker provides an alternate route for the current to flow

• A circuit-breaker can be reset

• A fuse can be reset

• A fuse is more expensive

An appliance works at 3A. What is the best option for a fuse in the circuit connected to this appliance and why?

• 5A, so that the fuse does not blow when the appliance is used normally

• 7A, since it allows a current much larger than needed for the appliance to flow in the circuit

• 2A, so that the fuse blows when the appliance is used normally

• 3A, since the fuse blows at the same value of current that the appliance needs

What is the difference between a.c. and d.c?

• d.c. is always a bigger current than a.c.

• a.c. is always a bigger current than d.c.

• a.c. remans constant in direction of current flow whereas d.c. oscillates in direction of current flow

• a.c. oscillates in direction of current flow whereas d.c. remains constant in direction of current flow

• There is no difference

Explain the meaning of the term "earthed".

• A wire that has a direct connection to the earth

• A wire that is directly covered with earth

• A wire made of earth

• An insulated wire that is buried in the earth

The current in a motor is 2.1 A and the potential difference across it is 12V. The motor takes 1.5 seconds to lift a mass. What is the energy transferred to the motor as it lifts the mass?

• 85 J

• 3.8 J

• 38 J

• 8.5 J

The process of creating a current in a circuit by changing a magnetic field

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. magnet

Tags

NGSS.HS-PS2-5

What happens to the strength of an electromagnet as you add more coils around it?

• Increases
• Decreases
• Stays the same
• Stops completely

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

This picture is an example of a ___________

• Step- Up Transformer
• Step- Down Transformer
• Motor
• Generator

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

Based on this picture, which side will have a higher voltage?

• Secondary
• Primary
• Both sides have the same voltage
• Cannot be determined