formula for current
current, power, voltage
current = power / voltage
formula for work done
work done, time, power
work done = power x time
formula for voltage
current, power, voltage
voltage = power / current
unit for power
watts (W) or kilowatts (kW)
symbol for current
I
unit for current
amps (A)
symbol for power
P
symbol for voltage
V
unit for voltage
volts (V)
formula for power
current, power, voltage
power = current x voltage
formula for power
work done, time, power
power = work done / time
formula for time
work done, time, power
time = work done / power
unit for work done
kilowatt-hours (kWh) or units
unit for time
seconds (s), minutes (m), or hours (h)
symbol for time
t
symbol for work done
E
formula for cost
work done, cost, cost per unit
cost = work done x cost per unit
one unit of energy is the same as…
one kilowatt of energy
formula for cost per unit
work done, cost, cost per unit
cost per unit = cost / work done
formula for work done
work done, cost, cost per unit
work done = cost / cost per unit
one kilowatt is the same as…
one unit of energy
unit for cost
pence or pounds
formula for current
current, charge, time
current = charge /time
formula for charge
current, charge, time
charge = current x time
formula for time
current, charge, time
time = charge / current
formula for resistance
p.d, resistance, current
resistance = p.d / current
formula for voltage
energy, voltage/potential difference, charge
voltage (p.d) = energy / charge
formula for energy
energy, voltage/potential difference, charge
energy = voltage (p.d) x charge
formula for charge
energy, voltage/potential difference, charge
charge = energy / voltage (p.d)
symbol for charge
Q
Unit for energy
joules (J)
OHM’s LAW
formula for potential difference
(current, potential difference, resistance)
p.d = current x resistance
what is ohm’s law?
p.d = current x resistance
formula for current
p.d, resistance, current
current = p.d / resistance
unit for resistance
ohms (Ω)
unit for charge
coulombs (C)
formula for magnification
image size/ actual size
