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Download Here we have some circuits with voltage sources.
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Here we have some circuits with voltage sources. We will determine whether these are valid circuits. The first circuit is 1 V applied across a resistor, which is valid. The second circuit is two series voltage sources, and the voltage simply add together to produce a net voltage of -1 V across the resistor. So this circuit is Ok. In the third circuit, each voltage source can establish its specified voltage across its terminals, so this is fine. In the next circuit, one source puts 1 V across the resistor while the other source puts 2 V across the resistor. This is not possible. We can’t have two different voltages across the same pair of terminals. So this is an invalid circuit. The next circuit has two sources that each put 1 V across the resistor. This circuit is marginally invalid because the two sources must be perfectly identical in order for this to be a valid connection. Realistically, physical voltage sources will be different, so this is not a good connection.