Summary
Highlights
Voltage is the force that propels electrons in a circuit, measured in volts. A battery is an example of a voltage source. Higher voltage means greater force for electrons.
Current is the flow of electrons in a circuit, measured in amperes. It circulates through conductor wires. Greater force or impulse (voltage) results in a larger current.
Voltage and current are directly related: higher voltage leads to higher current, and lower voltage leads to lower current.
Resistance is any electrical component that obstructs or opposes the flow of electrons, measured in ohms. A light bulb is an example of a resistor.
Current and resistance are inversely related: small resistance allows a large current, while large resistance results in a smaller current.
Every electrical circuit with current flow has three fundamental elements: voltage, current, and resistance.