Video Transcript
Fill in the blank. When a switch is what, electricity
flows, turning components on.
To answer this question, let’s look
at a simple circuit. Our simple circuit has a bulb, a
cell, a switch, and wires to connect these components together.
Now, let’s think about the function
of a switch. A switch is used to turn a circuit
on and off. A switch can either be open, like
it is here, or closed, like it is here. When the switch is open, it creates
a gap in the circuit. The gap in the circuit means that
electricity cannot flow around the circuit, so the circuit is off and the bulb will
not light up. When the switch is closed, the gap
in the circuit is also closed, which creates a complete circuit. When a circuit is complete, the
electricity has a complete path to flow round, so the circuit is on and the bulb
lights up.
So, the correct answer is
closed. When a switch is closed,
electricity flows, turning components on.
