Respuesta :
You need to connect your doorbell to the electricity in a battery. You should select a material that will accept the flow of electrons.
You can think of a circuit as a loop. In order for electric current to flow through the loop, the \sloop must not contain breaks. In other words, the circuit must \sbe closed. An open circuit has one or more breaks. Most \scircuits have an energy source, wires, a load, and a switch. As \smentioned, energy sources for circuits include generators and \sbatteries.
Machines that generate electricity from mechanical energy are called generators. In this lesson, we’ll focus on batteries. Inside a battery, two kinds of metals build up opposite charges. Negative charges build up on one end of the battery. Positive \scharges build up on the other end of the battery. This is why batteries are marked with \spositive sign (+) and a negative sign (–).
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