Electrostatics Flashcards

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1
Q

what is current?

A

current is the rate of the flow of charge

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2
Q

Equation

A

Q = It
charge = current x time

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3
Q

what causes current

A

a flow of electrons

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4
Q

Electric Conductors

A

Metals, Graphite. allow the flow of electrons

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5
Q

Electric Insulators

A

plastic, wood. do not allow flow of electrons

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6
Q

how build up electrostatic charge using friction

A

rub two insulating materials together the electrons will be transferred from one to the other and a charge builds up

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7
Q

when rubbing an insulator on polythene electrons are

A

transferred from the object to the rod (negative charge in rod)

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8
Q

when rubbing an insulator on perspex electrons are

A

transferred from the rod to the object (positive charge in rod)

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9
Q

How measure speed of sound in air

A

stand 400m away from someone with a clapper. Record the time it takes between when you see the clap and hear the clap.

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10
Q

dangers of Electrostatics refuelling planes

A

fuel is highly flammable. Fuel is a liquid insulator and when passed through pipes at a quick rate, charges are picked up. If there is a spark in the plane, there is a risk of explosion.

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11
Q

uses for Electrostatics

A

photocopiers and inkjet printers

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12
Q

how photocopiers and inkjet printers work

A
  1. An image of the document is projected onto a positively charged copying plate
  2. The dark parts retain a charge and the light parts lose the positive charge
  3. black toner powder(photocopier) or ink(inkjet) that is electrically charged sticks is attracted to the positively charged parts of the paper. paper is heated to make powder/ink stick
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13
Q

insulation

A

placing an insulator over a conductor to prevent electric current from going to another conductor.

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14
Q

double insulation

A

an extra layer of insulation

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15
Q

earthing

A

creating an electrical path into the ground in case of electrical malfunction

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16
Q

fuses

A

melt if the circuit’s current goes too high breaking the circuit. often found near the live wire in mains

17
Q

circuit breakers

A

automatic electric switches that protect circuits from overloading/short circuiting

18
Q

Mains electricity is … current

A

AC

19
Q

Batteries are … current

A

DC

20
Q

Difference between AC and DC curent

A

DC current flows only one way and is unchanged in terms of current flow. AC current flows one way and back the other way and is not constant. AC current looks like a wave DC current is a straight line