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

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

Regulate the voltage supplied to the appliance.

Protect the appliance from excessive current by breaking the circuit.

Increase the resistance of the appliance to save energy.

Convert electrical energy into light energy

None

A microwave oven operates on a 240 V supply and draws a current of 5.5 A. Which of the following standard fuses (1 A, 5 A, 10 A, 13 A) is the most appropriate choice for this appliance?

10 A

1 A

13 A

5 A

None

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

To decrease the overall resistance of the heating element.

To allow the wire to expand and contract without breaking.

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

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

None

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?

2.4 C

144 C

60 C

3.75 C

None

Which statement correctly describes the relationship defined by Ohm's Law for an ohmic conductor?

The potential difference across the conductor is inversely proportional to the current flowing through it.

The current flowing through the conductor is directly proportional to the resistance.

The potential difference across the conductor is directly proportional to the current flowing through it, provided physical conditions remain constant.

The resistance of the conductor is directly proportional to the current flowing through it.

None

A graph of potential difference (V) on the y-axis against current (I) on the x-axis is plotted for a constantan wire. What does the gradient of this graph represent?

Electric Charge, Q

Resistance, R

Power, P

Conductance, 1/R

None

A conductor is considered 'non-ohmic' if:

It is made from a material other than copper.

It does not conduct electricity at all.

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?

High electrical conductivity.

Low melting point.

High electrical resistance.

It is a non-ohmic conductor

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?

8100V

135V

0.25V

4.0V

None

10.

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?

9600 W

0.167 W

6 W

1440 W

None

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