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Physics > 8.2 Electricity > Flashcards

8.2 Electricity Flashcards

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1
Q

What is current?

A

The rate at which the charge of the electrons flow

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2
Q

What is current measured in.

A

Amps

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3
Q

What is voltage?

A

Voltage is the energy transferred per charge

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4
Q

Whats another word for voltage?

A

Potential difference

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5
Q

What unit is voltage measured in?

A

Volts

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6
Q

Which way does current flow?

A

Positive to negative

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7
Q

What is the definition of a series circut?

A

When components are on a single loop

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8
Q

What are the advantages of a series circut?

A

Fewer wires used, all the components are controlled by a single switch

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9
Q

What is the definition of a parallel circut?

A

Components on multiple branches

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10
Q

What is an advantage if a parallel circut?

A

Switches on each branch control components individually

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11
Q

What does an ammeter measure?

A

Ammeters measure current

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12
Q

What do ammeters measure in

A

Amps

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13
Q

How are ammeters placed in a circut?

A

They are placed in series with components to find the current flowing in that part of a circuit

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14
Q

What does a voltmeter measure?

A

Voltage

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15
Q

What does a voltmeter measure in

A

Volts

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16
Q

How is a voltmeter placed in a circuit?

A

They must be placed in parallel across a component to find the voltage dropped across it

17
Q

What Is The rule for current in a series circuit?

A

Current in a series circuit stays the same

18
Q

What is the rule for current in a parallel circuit?

A

Current in a parallel circuit splits at junctions

19
Q

What is the rule for voltage in a series circuit?

A

Voltage of a cell in a series circuit is split to all the components

20
Q

What can’t energy do?

A

Be made or destroyed

21
Q

What is the rule for voltage in a parallel circuit?

A

Voltage on each branche in a parallel circuit is the same as the cell

22
Q

What is ohms law?

A

Voltage is directly proportional to current through a fixed resistance.

23
Q

What is the equation that connects current, resistance and voltage?

A

V= I x R

24
Q

What is the unit for resistance?

A

Ohms

Physics (4 decks)

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