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JC Science > Uses Of Electricity And Electronics > Flashcards

Uses Of Electricity And Electronics Flashcards

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1
Q

Explain a diode

A

A device that allows an electric current to flow in one direction only

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2
Q

Does current flow forward biased or reverse biased

A

Forward biased

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3
Q

When is a diode used

A

Its a safety device in a complicated circuit ex. Mobile or computer

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4
Q

What LED stand for

A

Light emitting diode

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5
Q

When does a LED emit light

A

When it is forward biased

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6
Q

Give two examples of where an LED

A

Screens, mobile

Cash register price

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7
Q

What LDR stand for

A

Light dependent resistor

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8
Q

Explain what a LDR is

A

Light dependent resistor a resistor whose value of resistance can change light

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9
Q

What effect does bright light and dim light have on LDR

A

Bright- less resistance and more current

Dim- high resistance and less current

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10
Q

Give two examples when LDR’s are used today

A

Flash on camera

Streetlights

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11
Q

Explain direct current

A

A current that flows in one direction

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12
Q

Explain Alternating current

A

A current flows in a continually changing direction

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13
Q

Give an example of a home object or appliance using d.c. and a.c.

A

D.C- torch

A.C- Socket

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14
Q

What is the formula for electrical power(W)

A

Voltage(volts) X Current(amps)

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15
Q

How do you convert Electrical power(W) and kilowatts (kW)

A

Electrical power divided by 1,000= kilowatts (kW)

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16
Q

Give examples of how water can be heated using electricity

A

Using a heating coil

Ex- boiling a kettle, immersions heaters

17
Q

What is the purpose of a fuse

A

A fuse wire limits the size of the current flowing in a circuit and prevents circuit over-heating

18
Q

How does a fuse work

A

Fuse melts breaking the circuit and cutting off the electricity when overheating

19
Q

Explain the purpose of a circuit breaker

A

Limits the size of current slowing in a circuit

20
Q

How does a circuit breaker work

A

Circuit breakers switches are attracted by a magnet to switch off the circuit and can be turned back on by flicking up the switch

21
Q

Name the three wires in a plug

A

Live wire
Neutral wire
Earth wire

22
Q

What are the colours of the three wires in a plug

A

Live wire- brown
Neutral wire- blue
Earth wire- Yellow and Green striped

23
Q

Why is an LED more efficient than a normal bulb

A

It requires less current to light

JC Science (53 decks)

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