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Physics > Current Electricity > Flashcards

Current Electricity Flashcards

1
Q

What is Conventional Current? (used in syllabus)

A

Conventional current assumes that positive charges flow out of positive terminal, through circuit and into negative terminal of source

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2
Q

What is Electron Flow?

A

Electron flow is what actually happens, electrons flow out of negative terminal, through circuit and into positive terminal of source

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3
Q

Current Formula

A

I=Q/t

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4
Q

What is Current measured using?

A

Ammeter

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5
Q

What is a battery?

A

A source of energy that enables charges to be forced around a circuit.

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6
Q

What is an Electromotive Force (emf)?

A

The work done by the source in driving a unit charge around a complete circuit

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7
Q

Emf Formula

A

E=W/Q

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8
Q

Combined emf in series

A

Combined emf is x+x+x

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9
Q

Combined emf in parallel

A

Combined emf is x

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10
Q

What is Potential Difference?

A

The work done to drive a unit of charge through the component

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11
Q

P.d Formula

A

V=W/Q

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12
Q

What is Resistance?

A

Resistance is a measure of a material’s opposition to flow of electric charge.
Defined as the ratio of p.d (V) across it to the current (I) through it

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13
Q

What is P.d measured using?

A

Voltmeter

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14
Q

Resistance Formula

A

R=V/I

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15
Q

Common resistance components

A

Carbon resistors, LDR, Variable resistors

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16
Q

What is Ohm’s Law?

A

States that current in a conductor is directly proportional to p.d

17
Q

What are Ohmic Conductors?

A

Ohmic conductors are materials that obey ohm’s law (constant gradient graph)

18
Q

What are Non-Ohmic Conductors?

A

Non-ohmic conductors are materials that do not obey ohm’s law (increasing gradient graph)

19
Q

What are some factors that affect resistance?

A

Temperature, length, cross-sectional area and resistivity

20
Q

Resistivity Formula

A

R=p(l/A)

Physics (11 decks)

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