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Physics Term 2 > Current Electricity > Flashcards

Current Electricity Flashcards

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1
Q

Series

A

Only one path for current to flow

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2
Q

Parallel

A

More than one path for the current to flow

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3
Q

Potential difference

A

Energy transferred per unit positive to move it from one point to another

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4
Q

PD

A

Voltmeter in volts V= J/C
Voltmeter connected in parallel due to extremely high resistance

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5
Q

Voltmeter connected over a battery closed switch

A

Circuit is complete.
Reads the pd of the entire circuit.
(Terminal potential difference )
Measures the actual work done per unit

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6
Q

Voltmeter connected over a battery open switch

A

Circuit is incomplete
Voltmeter reads pd of the battery
This is EMF

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7
Q

EMF

A

Max amount of work a battery can do to move a unit positive charge from one terminal of the battery to another

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8
Q

Current

A

Rate of flow of charge

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9
Q

Current is measured in?

A

Ammeter in amperes A=C/s
Ammeter connected in series due to low resistance

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10
Q

Two types of current

A

Conventional current
Electron current

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11
Q

Resistance

A

Components that oppose the flow of current

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12
Q

Factors affecting resistance

A

1) Length ( long , high resistance)
2)thickener ( thick. Lower resistance)
3) temperature ( higher , high resistance)
4)type of material

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13
Q

Current in series circuit

A

Same

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14
Q

Current in parallel

A

Splits
A= A1 + A2

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15
Q

Pd ( V ) series

A

Splits

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16
Q

PD ( V ) Parallel

A

Same pd and the same pd as the entire parallel section

17
Q

Resistance in series

A

Rtot= R1 + R2 + R3

18
Q

Resistance Parallel

A

1/ Rp = 1 / 1Rp then flip

19
Q

Resistance is directly proportional to PD

A

If res increases PD increases
If res doubles pd doubles
If res increases by a factor of 3 pd increas by factor of 3

20
Q

Resistance inversely proportional to Current

A

If res increase current decreases by same proportion
If res doubles current halfs

21
Q

Ohms law

A

Pd across the end of a conductor is directly proportional tot he current in the conductor. Provided that the temperature remains constant

Physics Term 2 (6 decks)

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