Electric Circuit Flashcards
What is current
The rate of flow of charge
What is potential difference
Work done per unit positive charge
What is resistance
A materials opposition to the flow of electrical charge
What is ampere
The unit of electric current equal to a flow of one coulomb per second
What is EMF
The total energy supplied per coulomb of charge by the cell
What does a simple circuit contain a minimum of
A source (cell or battery), conducting material, and an appliance
What is the use of a cell or battery
To provide energy for charges to move
What is the use of a switch
Closes or opens a circuit
What is the use of a conductor
Connects the circuit elements
What is the use of a bulb
Glows when a current goes through it
What is the use of a voltmeter
It measures the potential difference
What is the use of an ammeter
If measure the current in a circuit
What is the direction of a current
Conventional current which is from positive to negative
What is a series circuit connection.
Components connected in a circuit in such a way there is only one path for current to flow
What is a parellel connection
Components are connected in parallel if there is more than one pathway for current to flow
What is ohms law
Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature
What are the ways to calculate voltage
V=IR V=w/Q
What are the ways to calculate current
I=q/t V=IR
What factors influence resistance
Length, temperature, type of conductor and thickness
What is needed for a fair investigation
Only one factor needs to be changing in order for an investigation to be fair
How does potential difference affect current
Potential difference is directly proportional to current
How does potential difference affect resistance
Potential difference is directly proportional to resistance
What is power
The rate at which energy is converted into other forms of energy
What is electrical power
The rate at which electrical energy is converted into other forms of energy in an electric circuit
What is one watt
The power when one joule of energy is transferred in one second
What are the equations we can use to calculate power
P = E/△t
P = VI
P = RI^2
P = V^2/R
How to get from kWh to Joules
Multiply by 3,6 x 10^6
How do you calculate the cost of electricity
Cost = amount electricity(kWh) x price (R)
How do we calculate the month cost of electricity
Monthly cost = daily cost x number of days in that month
