Resistor A resistor restricts the flow of charge. Uses include limiting the current passing through an LED, and slowly charging a capacitor in a timing circuit. Some publications use the old resistor symbol
Aerial (Antenna) A device to receive or transmit radio signals. It is also known as an antenna.
Voltmeter Measures voltage. The proper name for voltage is potential difference but voltage is more widely used.
Galvanometer A very sensitive meter used to measure tiny currents, usually 1mA or less.