I need help with these two questions! (They\'re separate!) for one of them I kno
ID: 1333218 • Letter: I
Question
I need help with these two questions! (They're separate!) for one of them I know the answer is D) 10V; point B but I don't know how to get there! Any help is appreciated a) b) c) In which circuit does the bulb glow more brightly? Explain your reasoning. In circuit (a) an ideal ammeter is connected in series with a bulb. Is the ammeter connected correctly, in order to measure the current through the bulb? If not, explain why not. In circuit (b) an ideal voltmeter is connected in series with a bulb. Is the voltmeter connected correctly, in order to measure the voltage across the bulb? If not, explain why not.Explanation / Answer
(a) Yes, it is the correct method.
An ammeter should have small a resistance as possible, so as not to change the current that we are trying to measure. Ammeter is connected in series with the circuit element. If it has high resistance, then the current flow in the circuit is reduced.
(b)No, it is not the correct method in order to measure the voltage drop.
A voltmeter should have very large resistance. Voltmeter is connected in parallel with the circuit element. Since it has high resistance, current flowing in the voltmeter is very less and does not alter the voltage that we are trying to measure. If it has low resistance, then the current flow through voltmeter and results some voltage loss.
(c)
In first circuit, the bulb does glow more brightly, because, the ammeter has less resistance, so current flow is more and light glow brightly.
In the second case, voltmeter has large resistance and opposes the current flow, so, the bulb glow dimly.
ACCORDING TO GUIDE LINES I ANSWER ONE QUESTION. PLEASE POST THE OTHER QUESTION SEPARATELY