Explain clearly, using Kirchhoff’s laws, why the resistance of an ideal voltmeter is infinite.
Answer to relevant QuestionsIf designed properly, a good ammeter should have a very small resistance. Why? Explain clearly, using Kirchhoff’s laws. If a large resistor and a small resistor are connected in series, will the value of the effective resistance be closer to that of the large resistance or that of the small one? What if they are connected in parallel? Find the current in and voltage across the resistor shown in Fig. 18.30. 10-Æ Two identical resistors (each with resistance R) are connected together in series and then this combination is wired in parallel to a 20-Ω resistor. If the total equivalent resistance is 10-Ω, what is the value of R? Find the currents in the circuit branches in Fig 18.38.
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