Electricity Flashcards
(16 cards)
What is electric current
and give example
Electricity or electric current is a flow of electric charge. e.g flow of electrons through a substance
From what side of a battery are electrons released
From the negative side
What is meant by bulbs in series
The same current flows through each bulb
Whats the device which measures current
ammeter
What is meant by bulbs in parallel
The current divides among bulbs
Whats another word for potential difference
voltage
What is meant by resistance
All materials try resist electrons some just do so better
Whats a fixed resistor
one value of resistance
whats a variable resistor
multiple values of resistance
Voltage =
current ( i ) x resistance
current ( i ) =
voltage divided by resistance
resistance =
voltage divided by current
power rating meaning
the higher the power rating the more energy that can be converted from one form to another in 1 second
(power rating) power=
voltage x current
(power rating) voltage =
power divided by current
(power rating) current =
power divided by voltage
