Electric Circuit Flashcards

1
Q

What is current

A

The rate of flow of charge

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2
Q

What is potential difference

A

Work done per unit positive charge

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3
Q

What is resistance

A

A materials opposition to the flow of electrical charge

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4
Q

What is ampere

A

The unit of electric current equal to a flow of one coulomb per second

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5
Q

What is EMF

A

The total energy supplied per coulomb of charge by the cell

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6
Q

What does a simple circuit contain a minimum of

A

A source (cell or battery), conducting material, and an appliance

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7
Q

What is the use of a cell or battery

A

To provide energy for charges to move

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8
Q

What is the use of a switch

A

Closes or opens a circuit

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9
Q

What is the use of a conductor

A

Connects the circuit elements

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10
Q

What is the use of a bulb

A

Glows when a current goes through it

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11
Q

What is the use of a voltmeter

A

It measures the potential difference

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12
Q

What is the use of an ammeter

A

If measure the current in a circuit

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13
Q

What is the direction of a current

A

Conventional current which is from positive to negative

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14
Q

What is a series circuit connection.

A

Components connected in a circuit in such a way there is only one path for current to flow

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15
Q

What is a parellel connection

A

Components are connected in parallel if there is more than one pathway for current to flow

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16
Q

What is ohms law

A

Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature

17
Q

What are the ways to calculate voltage

A

V=IR V=w/Q

18
Q

What are the ways to calculate current

A

I=q/t V=IR

19
Q

What factors influence resistance

A

Length, temperature, type of conductor and thickness

20
Q

What is needed for a fair investigation

A

Only one factor needs to be changing in order for an investigation to be fair

21
Q

How does potential difference affect current

A

Potential difference is directly proportional to current

22
Q

How does potential difference affect resistance

A

Potential difference is directly proportional to resistance

23
Q

What is power

A

The rate at which energy is converted into other forms of energy

24
Q

What is electrical power

A

The rate at which electrical energy is converted into other forms of energy in an electric circuit

25
What is one watt
The power when one joule of energy is transferred in one second
26
What are the equations we can use to calculate power
P = E/△t P = VI P = RI^2 P = V^2/R
27
How to get from kWh to Joules
Multiply by 3,6 x 10^6
28
How do you calculate the cost of electricity
Cost = amount electricity(kWh) x price (R)
29
How do we calculate the month cost of electricity
Monthly cost = daily cost x number of days in that month