Electricity Flashcards
What is electrical current?
I=V/R where V is voltage in volts and R is resistance in Ω.
What is potential difference?
Potential difference is also called voltage and is V=IR where I is current in amperes and R is resistance in Ω and is measured in volts.
What is the equation that links I,Q and t?
I=Q/t with I being current, Q being coulombs and t being time.
What is the equation that links V,Q and W?
V=W/Q where V is voltage in volts, W is the work done in Joules and Q is the charge in coulombs.
What is resistance?
R=V/I where R is resistance in Ω, is voltage in volts and I is current in amperes.
Which formula links V, I and R
V=IR
What is the difference between parallel circuit and series circuit?
Parallel circuit is split where as series circuit is all along one route.
What is Ohm’s law?
Ohm’s Law states that the current through a metallic conductor is proportional to the potential difference across it if the temperature remains constant.
What happens to the resistance of a metal conductor when the temperature increases?
The resistance also increases.
What happens to the resistance of a thermistor when the temperature increases?
The resistance decreases.
What is the formula for calculating resistance of a series circuit?
R1+R2…+Rn=Rt
What is the formula for calculating resistance in a parallel circuit?
1/R1+1/R2…+1/Rn=1/Rt
