Electricity and Magnetism

• Electric current is the flow of electric charges.
• A circuit is the path along which electric current travels.
• An electrical wire carries electric charges between the power source and the other parts of the circuit.
• An electrical load is any device that uses electricity.
• A closed circuit is a complete circuit. It allows electric current to flow.
• An open circuit is an incomplete circuit.
• Voltage is the strength of a power source.
• Resistance is the ability of a material to oppose or slow down electric current.
• The measurement of electrical resistance is called ohm, named after the German physicist, Georg Simon Ohm (1789-1854).
• The unit used in measuring voltage is volts.
• Voltage was named after Italian physicist, Alessandro Volta (1745-1827), who made the first chemical battery.