electricity
- voltage is alos linked to the energy changed by components in a circuit
- most components have a voltage rating
- voltmeter: used to measure voltage
- voltmeters measure the energy difference on either side of a component, the voltmeter is parallel with the component
- energy is always conserved, so the enrgy changed by the components must add up to the voltage of the supply
- voltages across components in a series circuit add up to the same voltage of the supply
- voltage in a series can be different across adifferent components