Spark image

Power lines

When low voltage is used there is too much energy lost due to the large current in the high resistance wires for the right hand bulb to light. The energy loss is I2R where I is the current in the power lines and R is their resistance. Using a transformer to increase the voltage and so decrease the current in the transmission lines the energy loss is very much reduced and the right hand bulb now comes on brightly.

Press Start to switch on the power supply and Trans to add transformers.

© Keith Gibbs/John Bourne 2009