An engineer is designing a bilge pump warning indicator circuit for a marine vessel. The prototype circuit contains a light-emitting diode (LED), a buzzer, and a fixed resistor, but it currently has a gap in the left-hand wire, as shown in the diagram.
To make the LED light up and the buzzer sound, a single cell must be inserted into the gap in the left-hand wire.
Describe how the cell should be oriented in the gap so that the LED is forward-biased and conventional current can flow through the circuit. Specifically, state whether the top or the bottom of the gap should have the long line (representing the positive terminal, +++) and which should have the short, thick line (representing the negative terminal, −-−) of the cell symbol.