Energy and Power in Circuits Flashcards Preview

Real P2 > Energy and Power in Circuits > Flashcards

Flashcards in Energy and Power in Circuits Deck (15):
1

Energy is [ ] from cells and other sources

transferred

2

Electricity is a form of energy therefore it's always [ ]

conserved

3

What component uses kinetic energy?

Motors

4

What component uses light energy?

Bulb

5

What component uses heat energy?

Hair dryers / kettles

6

What component uses sound energy?

speakers

7

What happens when current flows through anything with electrical resistance?
The more current that the [ ] that is produced

Electrical energy is converted into heat energy
more heat

8

How does voltage effect the amount of heat due to resistance?

Bigger voltage means more heating because it pushes more current through

9

How do filament bulbs work?

By passing a current through a very thin wire, heating it up so much that it glows. They waste a lot of energy as heat

10

If an appliance is efficient it wastes [ ]

less energy

11

What doe 'more efficient' appliances do?

Transfer more of their total electrical energy to useful energy

12

Name 2 power-saving lamps that waste less heat energy than filament bulbs

1) Compact fluorescent lamps (CFLs)
2) Light-emitting diodes (LEDs)

13

Energy Transferred =
(power)

Energy Transferred (kJ) = Power (kW) * Time (s)

14

What is the formula for electrical power?

Power (W) = Current (A) * Potential Difference (V)

15

What 3 ratings can you get on fuses in the UK?

3 A, 5 A or 13 A