Electricity and Circuits Quiz

What is the purpose of a fuse in an electrical circuit?

• To protect the circuit from overcurrent and prevent damage to the electrical components.

• To control the voltage in the circuit

• To make the circuit more efficient

• To provide extra power to the circuit

How is an electromagnet different from a permanent magnet?

• An electromagnet only works in space, while a permanent magnet only works on Earth.

• An electromagnet is used for cooking, while a permanent magnet is used for transportation.

• An electromagnet is made of copper, while a permanent magnet is made of iron.

• An electromagnet requires an electric current to produce a magnetic field, while a permanent magnet does not.

Explain the heating effect of electric current with an example.

• The heating effect of electric current is the production of sound in a conductor when an electric current passes through it. For example, when an electric current passes through a filament in a light bulb, it produces sound and light.

• The heating effect of electric current is the production of cold in a conductor when an electric current passes through it. For example, when an electric current passes through a filament in a light bulb, it produces cold and light.

• The heating effect of electric current is the production of heat in a conductor when an electric current passes through it. For example, when an electric current passes through a filament in a light bulb, it produces heat and light.

• The heating effect of electric current is the production of magnetic field in a conductor when an electric current passes through it. For example, when an electric current passes through a filament in a light bulb, it produces a magnetic field and light.

What is the magnetic effect of electric current? Provide an example.

• Magnetic effect of electric current

• Electric effect of magnetic current

• Thermal effect of electric current

• Gravitational effect of electric current

What material is commonly used for the fuse wire in a fuse?

• Rubber

• Plastic

• Metal with a low melting point

• Glass

Describe the construction and working of an electromagnet.

• An electromagnet is made by wrapping a coil of wire around a plastic core.

• An electromagnet works by using a battery to create a magnetic field.

• An electromagnet is constructed by placing a magnet inside a coil of wire.

• An electromagnet is constructed by wrapping a coil of wire around an iron core. When an electric current flows through the coil, it creates a magnetic field, turning the iron core into a magnet.

How does the heating effect of electric current make an electric iron work?

• The electric iron works by converting sound waves into heat energy.

• The electric iron works by using a magnetic field to generate heat.

• The resistance wire in the electric iron heats up due to the heating effect of electric current.

• The electric iron works by absorbing heat from the surrounding environment.

State the right-hand rule for the direction of the magnetic field around a current-carrying conductor.

• There is no rule for the direction of the magnetic field

• Use the right-hand rule

• Use the left-hand rule

• The direction of the magnetic field is determined by the current

What happens to the fuse wire when the current passing through it exceeds the rated value?

• It becomes stronger and more conductive

• It turns into a solid metal bar

• It emits a warning sound

• It melts and breaks the circuit

Explain the application of the magnetic effect of electric current in an electric bell.

• It causes the bell to light up

• It generates heat in the bell

• It creates a magnetic field that attracts the metal armature to strike the bell and produce sound.

• It increases the resistance in the circuit