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Physics > Electric Quantities > Flashcards

Electric Quantities Flashcards

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1
Q

What is current

A

Rate of flow of charge

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2
Q

What is the formula for current

A

I=q/t

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3
Q

What is the definition of one amp

A

When one coulomb of charge flows through a conductor/wire every second

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4
Q

What is voltage

A

The amount of energy supplied per coulomb of charge

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5
Q

What is the formula of voltage

A

V=IR, V=E/Q, E=VIT

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6
Q

What is conventional current

A

The flow of current from positive to negative.

The flow of free electrons from negative to positive

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7
Q

What is emf

A

The amount of energy supplied to each coulomb of charge from non electrical to electrical form to move the charges around the circuit

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8
Q

What is pd

A

The amount of energy supplied to each coulomb of charge from electrical to non electrical form between two points in a circuit

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9
Q

What is an ammeter

A

It’s used to measure current in a circuit and is always connected in series and has negligible resistance

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10
Q

What is a voltmeter

A

It’s used to measure voltage across a component and is always connected in parallel and has infinite resistance

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11
Q

What is a short circuit

A

A short circuit occurs when there’s a path with less resistance as current travels through the shortest path

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12
Q

What is resistance

A

The ratio of the voltage across the component to current flowing through the component

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13
Q

What is the definition of one ohm

A

Resistance of the material when one amp of current flows through it if the pd applied across is one volt

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14
Q

What is ohms law

A

Current flowing through a conductor is directly proportional to the pd across it provided that resistance is constant

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15
Q

What is resistivity

A

The property of a material that determines it’s ability to conduct electricity

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16
Q

What is the relationship between resistance and length

A

They are directly proportional

17
Q

What is the relationship between resistance and cross sectional area

A

They are inversely proportional

18
Q

Current in series circuits

A

Current is equal at all points

19
Q

Current in parallel circuits

A

Current is shared by each branch

20
Q

Voltage in series circuits

A

Voltage is split

21
Q

Voltage in parallel circuits

A

Voltage is equal in every branch

22
Q

What is Direct current(DC)

A

Flow of electrons in one direction only

23
Q

What is AC

A

Direction of flow reverses periodically

24
Q

What are electric insulators

A

Materials that don’t have free electrons therefore electricity doesn’t flow through them

25
Q

What are electric conductors

A

Materials that have free electrons and electricity flows through them

26
Q

How can an insulator become charged

A

By rubbing with another insulator due to which electrons are transferred from one material to the other

27
Q

What is confined charge

A

When electrons are transferred in a certain region and cant flow because the object is an insulator

28
Q

What is induced charge

A

The process by which electrical charges in an electrically neutral object are re arranged due to a presence of a charged object close to them without any contact

29
Q

What is earthing

A

The process by which a conductor can be neutralised electrically either by adding or removing electrons from the conductor. Earthing is done by connecting the conductor to the ground

30
Q

What is an electric field

A

A region of space around a charged object in which it can exert a force on another charged object.

31
Q

What direction do positive charges go

A

Outwards

32
Q

What direction do negative fields go

A

Inwards

33
Q

What are the dangers of static electricity

A

Filling fuels, rolling paper and grain shoots

34
Q

What are the dangers of static electricity

A

Filling fuels, rolling paper and grain shoots

Physics (3 decks)

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