P6e Transforming
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Describe that a transformer changes the size of a voltage – it does not change AC into DC.
State and recognise that transformers do not work with DC.
Describe that transformers can increase or reduce a voltage.
State and recognise that:
- step-down transformers reduce voltage;
- step-up transformers increase voltage.
Describe that step-down transformers are used in a variety of everyday applications e.g. phone chargers, radios, laptops.
State that an isolating transformer is used in a bathroom shaver socket.
Describe that step-up transformers are used to increase the voltage from the generator at a power station to supply the National Grid.
Describe that step-down transformers are used in sub-stations to reduce the voltage for domestic and commercial use.
Explain that a transformer changes the size of an alternating voltage.
Describe the construction of a transformer as two coils of wire wound on an iron core.
Describe the difference in construction of a step-up and a step-down transformer.
Be able to state and manipulate the equation:
Vp / Vs = Np / Ns
Describe that an isolating transformer is used in some mains circuits (e.g. bathroom shaver socket) for safety reasons.
Explain the reason for using an isolating transformer.
Describe that power loss in the transmission of electrical power is related to the square of the current flowing in the transmission lines.
Explain why the use of transformers requires the use of alternating current.
Describe how the changing field in the primary coil of a transformer induces an output voltage in the secondary coil.
Explain that isolating transformers:
- have equal numbers of turns in the primary and secondary coils;
- limit the risk of contact between live parts and the earth lead.
Use and manipulate the equation:
Vp x Ip = Vs x Is
applied to a transformer.
Use this relationship to explain why power is transmitted at high voltages.
Objectives:
stuff what is important goes hereContent 3Content 4Content 5Content 2
Prior Learning:
Difficult Concepts:
Outline:
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Homework:
Homework1
Objectives:
Content 1
Prior Learning:
Difficult Concepts:
Outline:
Suggested Practicals:
Extension Activities:
Homework:
Homework2 again