Reducing unwanted energy transfer

• When there is electric current in resistor, What is there?

  Energy transfer which heats resistor
• When electrical current does work againt resistance

  Energy is dissipated into thermal energy stores of surroundings
• What do collisions between electrons and lattice ions make?

  Energy transfers in electrical circuits
• unwanted energy transfers reduced by

  • Low resistance wires so less energy is lost so use thick wires
• Why does national grid use aluminium wires

  Thick to reduce amount of energy lost to surrounding