Adding more batteries to a simple circuit will increase the electrical ... This can be used to switch it on and off. When a switch is open (off), there is a gap in the circuit.

Here’s a simple FET circuit that lets you switch power to, say, a USB port, kind of like a valve that interrupts the current flow. This circuit uses a P-FET – to turn the power on, open the ...

When the switch is tuned off, the circuit is open so the electrical energy stops ... engineers know what to build. Try building simple circuits with your friends and draw diagrams to match what ...