Ohm's Law
Ohm = Resistance R or Impedance measured in Ohm's
Amp (Ampere) measured in Amp's - A
Volt (Voltage) measured in Volts - V
Calculation expressions are:
V = I x R
R = V / I
I = V / R
This simple formula is massively important in basic electrical engineering calculations one example is below:
To establish the voltage dropped in a 30m long 2.5mm 6242B (Twin and Earth) cable with an applied load of 10A:
A - Load Current = 10A
R -Voltage drop = 7.41 ohms per km (0.00741 V /m)
Voltage Drop = L x R x A
= 30 x 0.00741 x 10
= 2.223 Volts Dropped along the 30m length
Amp (Ampere) measured in Amp's - A
Volt (Voltage) measured in Volts - V
Calculation expressions are:
V = I x R
R = V / I
I = V / R
This simple formula is massively important in basic electrical engineering calculations one example is below:
To establish the voltage dropped in a 30m long 2.5mm 6242B (Twin and Earth) cable with an applied load of 10A:
A - Load Current = 10A
R -Voltage drop = 7.41 ohms per km (0.00741 V /m)
Voltage Drop = L x R x A
= 30 x 0.00741 x 10
= 2.223 Volts Dropped along the 30m length
Sigma RJ Ltd visit
Museu de Electricidade Casa da Luz
Funchal, Portugal
Museu de Electricidade Casa da Luz
Funchal, Portugal
