Here is the transformer equation. V P V S = N P N S , copy that equation and state what each of the four symbols represents.

The transformer equation is given here. V P V S = N P N S It is applicable for both the step-up and the step-down transformer. When the number of turns in the secondary coil is more than the primary, the voltage produced in the secondary coil will be more than the voltage in the primary coil. This is what the equation conveys. The terms are: V P ⇒ Primary Voltage V S ⇒ Secondary Voltage N P ⇒ Number of turns in the primary N S ⇒ Number of turns in the secondary.

Here is the transformer equation. V P V S = N P N S , copy that equation and state what each of the four symbols represents.

The transformer equation is given here. V P V S = N P N S It is applicable for both the step-up and the step-down transformer. When the number of turns in the secondary coil is more than the primary, the voltage produced in the secondary coil will be more than the voltage in the primary coil. This is what the equation conveys. The terms are: V P ⇒ Primary Voltage V S ⇒ Secondary Voltage N P ⇒ Number of turns in the primary N S ⇒ Number of turns in the secondary.

A student holds a bent piece of wire in a horizontal magnetic field, as shown. She moves the wire downwards through the field, and then upwards. She now moves the wire horizontally from side to side in the magnetic field. Will an e.m.f. be induced? Give a reason to support your answer.

When a conducting wire is moved through a perpendicular field, there will be a motional emf induced between the ends of the wire. An induced current will be flowing through it and its direction is given by the Fleming's right-hand rule. The e.m.f depends on the magnetic field and the speed of the motion. Here, using Fleming's right-hand rule, the motion of the wire is parallel to the field. Therefore, there will be no e.m.f produced in the wire. It is because the force which was responsible for the charges in the wire to move to create an e.m.f, the lorentz force, will be zero, as the motion of the wire is parallel to the field.

Electrical power is often transmitted over long distances in high-voltage power lines (cables). Transformers are used to increase the voltage provided by the power station and to reduce the voltage for the final user. A transformer has 10 turns of wire on its primary coil and 200 turns on its secondary coil. If the p.d. across the primary coil is 3 . 0 V a.c., what will the e.m.f. across the secondary be?

As the transformer equation suggests that the e.m.f induced depends on directly to the number of turns of the coil. If the number of turns are increased to n times from primary to secondary, the e.m.f induced in the secondary, will also be n times the primary. The transformer equation, V P V S = N P N S ⇒ 3 . 0 V S = 10 200 ⇒ V S = 200 × 3 10 = 60 V

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Earn 100

Here is the transformer equation. $\frac{V_{P}}{V_{S}} = \frac{N_{P}}{N_{S}}$ , copy that equation and state what each of the four symbols represents.

Important Questions on Electromagnetic Induction

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 8

The equation below is for a transformer that is

100 %

efficient. Copy the equation and state what each of the four symbols represents.

I_{p} \times V_{p} = I_{s} \times V_{s}

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 9

A student holds a bent piece of wire in a horizontal magnetic field, as shown. She moves the wire downwards through the field, and then upwards.

Question Image

Explain why an e.m.f. is induced between the ends of the wire.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 9

A student holds a bent piece of wire in a horizontal magnetic field, as shown. She moves the wire downwards through the field, and then upwards.

Question Image

How will the e.m.f. differ between moving the wire downwards and moving it upwards?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 9

A student holds a bent piece of wire in a horizontal magnetic field, as shown. She moves the wire downwards through the field, and then upwards.

Question Image

Suggest how she could move the wire to induce a bigger e.m.f. across its ends.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 9

A student holds a bent piece of wire in a horizontal magnetic field, as shown. She moves the wire downwards through the field, and then upwards.

Question Image

She now moves the wire horizontally from side to side in the magnetic field. Will an e.m.f. be induced? Give a reason to support your answer.

HARD

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 10

Electrical power is often transmitted over long distances in high-voltage power lines (cables). Transformers are used to increase the voltage provided by the power station and to reduce the voltage for the final user. Explain why electricity is transmitted at high voltage like this.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 10

10

turns of wire on its primary coil and

200

turns on its secondary coil. If the p.d. across the primary coil is

3.0 V

a.c., what will the e.m.f. across the secondary be?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 21 - Electromagnetic Induction>End-of-chapter questions>Q 10

Electrical power is often transmitted over long distances in high-voltage power lines (cables). Transformers are used to increase the voltage provided by the power station and to reduce the voltage for the final user. How would the same transformer be used as a step-down transformer?

Here is the transformer equation. VPVS=NPNS, copy that equation and state what each of the four symbols represents.

Important Questions on Electromagnetic Induction

Learn and Prepare for any exam you want !

Here is the transformer equation. $\frac{V_{P}}{V_{S}} = \frac{N_{P}}{N_{S}}$ , copy that equation and state what each of the four symbols represents.