An electrical circuit is a wired path between two or more points that carries an electrical current. A simple circuit has a source of voltage (often a battery), a conductive path that allows for the movement of charges (typically wire), and a resistor (possibly a light bulb, a motor, a speaker, etc.)
Important to know! Ohm’s Law is the most frequently tested concept on electrical circuits on the ACT. It will be provided for you, but just so you know, it is V = I x R (where V is the voltage measured across the conductor in volts, R is the resistance in ohms, and I is the current measured in amperes.)