Kuiz Sains Tambahan Tingkatan 5 Bab 7 Set 1

SELAMAT DATANG Kuiz Sains Tambahan Tingkatan 5 Bab 7 Set 1

Elektrik (English)

KUIZ INI MENGANDUNGI 10 SOALAN

What is the definition of one volt (1 V)?

One joule of work is done to move one coulomb of charge between two points.

One ampere of current flows when one coulomb of charge passes a point

One joule of energy is dissipated in one second.

A current of one ampere flows through a resistance of one ohm.

None

An electric heater has a power rating of 1500 W. How much electrical energy does it consume in 10 minutes?

15,000 J

25 J

900,000 J

150 J

None

The main purpose of a fuse in an electrical appliance is to:

Protect the appliance from excessive current by breaking the circuit.

Convert electrical energy into light energy

Increase the resistance of the appliance to save energy.

Regulate the voltage supplied to the appliance.

None

What is the primary reason for coiling the wire of a heating element in an appliance like an electric kettle?

To create a magnetic field that helps heat the water faster.

To decrease the overall resistance of the heating element.

To fit a very long wire into a compact space to achieve high total resistance.

To allow the wire to expand and contract without breaking.

None

A conductor is considered 'non-ohmic' if:

It does not conduct electricity at all.

It is made from a material other than copper.

It has a very high resistance value.

Its resistance changes as the current or voltage changes

None

Nichrome is often used for heating elements in appliances like toasters and electric kettles. Which property of nichrome makes it suitable for this purpose?

Low melting point.

It is a non-ohmic conductor

High electrical conductivity.

High electrical resistance.

None

A toaster has a heating element with a resistance of 40Ω. If it is connected to a 240 V power supply, what is its power dissipation?

1440 W

0.167 W

9600 W

6 W

None

Which of the following changes would increase the electrical resistance of a metallic conductor?

Increasing its diameter.

Increasing its temperature.

Decreasing its length.

Changing the material from nichrome to silver.

None

A battery does 180 J of work to move 45 C of charge through a component in a circuit. What is the potential difference across the component?

4.0V

0.25V

135V

8100V

None

10.

An electric current of 0.8 A flows through a lamp for 3 minutes. What is the total electric charge that passes through the lamp?

3.75 C

60 C

144 C

2.4 C

None

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