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Physics > In most transformers, the power output is less than the power input. State why. > Flashcards

In most transformers, the power output is less than the power input. State why. Flashcards

(most) transformers are not 100% efficient

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Physics (20 decks)

Give one reason why an electromagnet would be used rather than a permanent magnet.

Describe how the students could build an electromagnet. Include in your answer how the students should vary and test the strength of their electromagnet.

2 (a) There is an alternating current in the primary coil of the transformer. State what is produced in the iron core.

(1)A transformer has only one turn of wire on the secondary coil. The potential difference across the secondary coil is 11.5 V The potential difference across the primary coil is 230 V

(2)Calculate the number of turns on the primary coil.

In most transformers, the power output is less than the power input. State why.

State the resolution of the voltmeter. Give one reason why the resolution of the voltmeter is suitable for this investigation

Both students recorded their results correctly. Give the reason why student 2 got different results from student 1.

The students decided that even though the results were different, there was no need to repeat the investigation. How do the results show that the investigation is reproducible?

State the name of the process which causes the potential difference to be produced in this investigation.

A transformer has been developed that can be used with many different devices. Suggest one advantage of having a transformer that can be used with many different devices.

Ultrasound is used to scan unborn babies but X-rays are not used to scan unborn babies. Explain why.

The behaviour of ultrasound waves when they meet a boundary between two different materials is used to produce an image. Describe how.

The closest distance between the unborn baby and the mother’s skin is 4.0 cm. calculate the average speed of the pulse.

Describe how X-rays are able to produce an image of bones

X-rays are able to produce detailed images because their wavelength is very ________________________ .

Which one of the following pairs of angles correctly identifies the angle of incidence and the angle of refraction?

The glass used to make this optical fibre has a refractive index of 1.5. Calculate the critical angle of the glass. Give your answer to 2 significant figures

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