How do you make a torch circuit?

Take a battery, a wire and a little light bulb. Put the wire on the flat part of the battery then put the other end of the wire on the side part of the bottom of the light bulb. Put the end of the...

A simple circuit can be built as follows: first you must have a power source - such as a battery then you'll need a load - that could be a light bulb that has the same voltage as the battery then use...

we can make an open circuit by disconnecting the wire or break the circuit and a closed circuit is made by connecting all wires with the contents of the circuits.

A: practically any series resistance will do that

All you need to do is provide enough bias current thru the diode, usually less than 20 mA. Find a datasheet and look at the bottom for recommended circuits.