Starting with these assumptions, we will develop a model that we can use to acco

Question

Starting with these assumptions, we will develop a model that we can use to account for the behavior of simple circuits. The construction of a scientific model is a step-by-step process in which we specify only the minimum number of attributes necessary to account for the phenomena under consideration In order to measure voltages across circuit elements in a DC circuit, we say that we wire the voltmeter in parallel with the circuit element under test. In order to measure currents through circuit elements we say that we wire the ammeter in series with the circuit element. Consider the circuit diagram at right. The voltmeter is in parallel with the light bulb (the circuit element) and the ammeter is in series with the light bulb. Suppose that you remove the voltmeter and replace it with either (i) a bare wire, (ii) another light bulb, or (iii) a broken wire as shown below. If you wanted to keep the ammeter reading (essentially) the same as before, which would be the best choice? Explain.

Explanation / Answer

If we connect bare wire in parallel with bulb, it makes the total resistance of circuit would remain the same if bare wire has same resistance as internal resistance of voltmeter thus current reading will not change. thus ammeter reading will not change.

When another bulb is connected in parallel, the resistance of circuit will change. When we connect a broken wire in parallel with the bulb, the total resistance of the circuit will change as there is no resistance connected in parallel with the bulb.

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