In the circuit, the voltmeter shows a voltage of 11 V, and the ammeter shows a current of 2 A.
September 30, 2021 | education
| In the circuit, the voltmeter shows a voltage of 11 V, and the ammeter shows a current of 2 A. The EMF of the current source is 12 V. Find the resistance of the resistor and the internal resistance of the current source.
Given:
U – 11 V.
I – 2 A.
E (EMF) – 12 V.
Find:
R -?
r -?
Solution:
First, we find the resistance of the resistor using the formula:
R = U / I.
The values are known, we substitute them into the formula:
R = 11/2 = 5.5 ohms.
Now let’s find the internal resistance of the current source. Let’s transform the formula:
I = E / R + r.
r = E / I – R.
Substitute the values into the formula:
r = 12/2 – 5.5 = 0.5 ohm.
Answer: R = 5.5 ohms, r = 0.5 ohms.
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