Electricity Flashcards

1
Q

Force =

A

Mass*acceleration

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2
Q

Pressure =

A

Force/area

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3
Q

Work done =

A

Force*distance

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4
Q

Power =

A

Charge*voltage

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5
Q

Charge =

A

Current*time

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6
Q

Voltage =

A

Work done/charge

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7
Q

Resistance =

A

Voltage=current

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8
Q

Kirchhoffs first law

A

Sum of current into a junction is equal to current flowing out of it

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9
Q

Current definition

A

Rate of flow of charge

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10
Q

EMF definition (electromotive force)

A

Amount of energy transferred from chemical to electrical for every coulomb of charge

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11
Q

Coulomb definition

A

Charge that flows past a point in 1 second when the current is 1

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12
Q

P.d definition

A

Energy transferred to any other form of energy per unit charge

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13
Q

Charge*Voltage =

A

1/2mv^2

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14
Q

Charge of electron*Volatge =

A

1/2mv^2

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15
Q

1 volt =

A

The p.d between 2 points when 1 joule of work is done to move a charge of 1 coulomb

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16
Q

Power definition

A

Rate of transfer of energy

17
Q

Resistance definition

A

Ratio of p.d to current across a component

18
Q

Ohms law

A

For an ohmic conductor at a constant temp the current is directly proportional to the p.d

19
Q

Percentage uncertainty =

A

Absolute uncertainty/measured value*100

20
Q

Resistance =

A

(Resistivity*length)/area

21
Q

When the temp increases…

A

The particles vibrate more which increases the resistance

22
Q

Resistance in a filament lamp

A

-current flowing causes temp to increase
-temp increases causes the metallic lattice to vibrate more
-more vibrations mean more frequent collisions with electrons
-increases resistance

23
Q

Resistance in a diode

A

-only conducts in one direction after threshold p.d is reached
-current increases by much greater proportion then p.d
-a protective resistor must be placed in the circuit to protect it as the diode has effectively no resistance

24
Q

Resistance in a thermistor

A

-ohmic conductor so constant temp = constant resistance
-semiconductor so more free electrons released as temp increases so more charge can be carried
-this means resistance falls as temp increases