Current Electricity Flashcards
Current
Movement of electrons
What is current measured in
Amps
What is the symbol for current
I
What is current measured using
An ammeter
Voltage
Is the measure of the force that a power supply has to drive a current
Voltage is measured in
Volts
The symbol for voltage is
V
Voltage is measured using a
voltameter
Resistance
Is the ability of a substance to reduce current
Resistance is measured in
Ohms
The symbol for resistance is
R
Resistance is measured using a
Ohmmeter
Ohms law
VIR
Direct current
Pushes currents in one direction only e.g. Battery
Alternating current
Currents which is constantly changing direction (changes 100 times every second)
Bulbs in series
If you remove one bulb the other gulf will not light
Bulbs in parallel
If yo remove one bulb the other bulb will stay lighting
Straight line graphs
Shows that the voltage is directly proportional to the current
What are the 3 effects of electricity
- ) Heating effect
- ) Chemical effect
- ) Magnetic effect of electricity
What is the everyday use of the chemical effect of electricity
Electromagnet
What is the unit of electricity
Kilowatt-hour
What is the kilowatt-hour
Is the energy used when 1 kilowatt of power I’d used for 1 hour.
How do you work out the kilowatt- hrs?
No. of kilowatts multiplied by the total no. = kilowatt hours
How do you find the cost of using electrical appliances
Cost= no. of kilowatts multiplied cost per unit
