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Power of Electrical Appliances


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  • A moving charge transfers energy as the charge does work against the resistance of the circuit
  • Electrical appliances transfer energy to components in the circuits when some current flows.
  • No appliance transfers all energy usefully. Higher current = more energy transferred to the thermal energy stores of components
  • Energy transferred depends on how long the appliance is on for and itspower .
  • Power = energy transferred per second.
  • More energy transferred in a given time = higher power
  • Energy Transferred (J) = Power (W) X Time (s)
  • E=Pt
  • Appliances have power ratings (maximum safe power that it can operate at). They tell youmaximum amount of energy transferred between stores per second when appliance is in use = can compare models as lower power rating means less electricity an appliance uses, so cheaper to run.
  • Higher power means transfers more energy but may not be more efficient. It may transfer a lot of the energy as wasted energy or transfer the same amount of energy usefully.

How long have you…? (present perfect 4) Exercises


 

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Use the information given to create questions beginning with ‘How long…?’

• It is snowing.

• The weather is shining.

• John and Kate are married.

• My brother has gone on holiday.

• My aunty and uncle live in Canada.

• My sister is a teacher.

• I work at the chemist.

• I’ve known Susan since I was a baby.

• Jonathan is learning to speak to Mandarin.

 

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Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

• I have known Kate a long time.

• My brother has been playing the piano he was 11 years old.

• My mum and dad on holiday to America. They

gone since last Sunday.

• I Ben and Emma since primary school.

We to the same primary and secondary school.

• My sister learning to speak French because she
is going to France next month.

 

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Use the appropriate words in the missing gaps.

have you lived       lives      to

has been       works        have known

I have bought       have worked.

• My sister in Spain. She is studying Spanish

with her friend Rosie. I Rosie since I was 5.

• Spencer like with Jamie. They have worked

together for 2 years.

• How long in Australia?

• a new dress for prom.

• He to Thorpe park.

 

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Challenge: Create 4 of your own questions beginning with ‘How long……?’

1.

2.

3.

4.

 

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