Save guides, add subjects and pick up where you left off with your BBC account. Electrical energy flows around circuits which are loops made of metal wires. In this game, touching the wire with ...

The circuit emits an audible warning tone from a piezo buzzer, or flashes an LED for each discharge ... with its relaxation optimised via the bias resistor values shown in the circuit diagram. The ...

The buzzer at the output of the receiver is activated when the light beam is interrupted by a person passing through it. The transmitter and receiver circuits of the infrared alarm system shown here ...