![]() However, whenever either or both of the switches are closed, power flows and the light will turn on. When both switches are open power does not flow and the light bulb is off. As was the case with the series circuit, there are four possible configurations of the circuit: (1) both switches open, (2) the first switch open and the second closed, (3) the first switch closed and the second open, or (4) both switches closed. Illustrates the four possible configurations of a two-switch parallel circuit. Two switches in parallel – power flows when either A or B is closed In a two-switch parallel circuit, each of the switches is placed on a separate path between the power source and the light bulb. This second type of circuit arranges the switches in parallel rather than in series. Īnother type of circuit can be designed using two switches. The relationship between the states of the two switches (open or closed) and the state of the light bulb (on or off) is summarized in tabular form in. ![]() Said another way, if both switch A and switch B are closed, then the light will turn on. Only when both switches are closed, does power flow and the light bulb illuminates. In series circuits, when either or both of the switches, are open, power will not flow and the light bulb will be off. The circuits of are called series circuits since the two switches occur on the same “path” from the power source back to itself. illustrates the four possible configurations of this circuit: (1) both switches open, (2) the first switch open and the second closed, (3) the first switch closed and the second open, or (4) both switches closed. We can increase the complexity of our circuit somewhat by adding a second switch between the first switch and the light bulb. Two switches in series – power flows only when both A and B are closed shows these two situations and records this information in tabular form. If the switch is open, the light is off if the switch is closed, the light is on. The simplest circuit that can be built contains a power supply, a single switch, and a light bulb. Representations of switches and light bulbs illustrates both the switches and light bulbs. Light bulbs will be used to indicate the presence or absence of current. We will assume that these switches are connected to a source of power that can supply current. These switches are similar to the electrical switches in your home. Our first model uses mechanical switches that can be either open or closed.
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