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SIZIF [17.4K]
4 years ago
14

Consider three resistors with unequal resistances connected in series to a battery. Which of the following statements are true?

Physics
1 answer:
Ivenika [448]4 years ago
7 0
<h2>Answer: The second Statement </h2>

<h2>The algebraic sum of the currents flowing through each of the three resistors is equal to the current through the battery.  </h2><h2 />

In a series circuit, the value of the equivalent resistance R_E is equal to the sum of the values of each of them:  

R_ {E}=R_{1}+R_ {2}+R_ {3}  

Where:  

<h2>The equivalent resistance of the combination of resistors is greater than the resistance of any one of three resistors. </h2>

In this case the current I flowing through the resistors is the same in each one. This is because the current flowing through the circuit only has one way to go, so the current intensity is the same throughout the circuit.

Therefore:  

<h2>The current flowing through each of the resistors is the same and is equal to the current through the battery.  </h2><h2>The algebraic sum of the voltages across the three resistors is equal to the voltage across the battery.  </h2>

The battery provides a voltage V_T that is the sum of the different voltages at the ends of the resistors:  

V_{T}=V_{1}+V_{2}+V_{3}  

Where the Voltage, according to Ohm's law is:  

V=R.I  

Hence, the second statement of this question is <u>True </u>

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1. All the relevant resistors are in series, so the total (or equivalent) resistance is the sum of the resistances of the resistors: 20 Ω + 80 Ω + 50 Ω = 150 Ω [choice A].

2. The ammeter will read the current flowing through this circuit. We can find the ammeter reading using Ohm's law in terms of the electromotive force provided by the battery: I = ℰ/R = (30 V)(150 Ω) = 0.20 A [choice C].

3. The voltmeter will measure the potential drop across the 50 Ω resistor, i.e., the voltage at that resistor. We know from question 2 that the current flowing through the resistor is 0.20 A. So, from Ohm's law, V = IR = (0.20 A)(50 Ω) = 10. V, which will be the voltmeter reading [choice F].

4. Trick question? If the circuit becomes open, then no current will flow. Moreover, even if the voltmeter were kept as element of the circuit, voltmeters generally have a very high resistance (an ideal voltmeter has infinite resistance), so the current moving through the circuit will be negligible if not nil. In any case, the ammeter reading would be 0 A [choice B].

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determine the maximum angle theta for which the light rays incident on the end of the optical fiber of radius 1 mm are subhect t
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