Mr Reading Physics Exam

These cards are aimed at  Unit G482

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Electric Current (1)

What is Electric Current?

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Electric Current (1)

An Electric is a flow of charge. In a metal this is due to the flow of electrons. In an electrolyte, the flow of +ve & -ve ions produces the current.

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Electric Current (2)

The direction of convectional current is from +ve to -Ve; the direction of electron flow is from -ve to +ve.

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Electric Current (2)

What is the Direction of Convectional current?

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Electric Current (3)

What is a coulomb?

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Electric Current (3)

One Coulomb is the charge which passes a point when a current of 1A flows for 1s.

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Electric Current (4)

What connects charge?

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Electric Current (4)

charge = current x time.

(delta)Q=I(delta)T

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Electric Current (5)

What is the Elementary Charge?

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Electric Current (5)

                                          

e = 1.6x10^-19C

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Electric Current (6)

State Kirchhoff's First Law.

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Electric Current (6)

Kirchhoff's 1st law states that the sum of the currents entering any point in a circuit is equal to the sum of the currents leaving the same point.

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Electric Current (7)

What do the letters mean in the equation I=Anev?

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Electric Current (7)

I= Current

A= Cross-sectional Area

n= Number density

V= mean drift Velocity

e= elementary charge

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