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pshichka [43]
3 years ago
15

A battery with an emf of 1.50 V has an internal resistance r. When connected to a resistor R, the terminal voltage is 1.40 V and

the current is 0.17 A. What is the value of the external resistor R?
Physics
1 answer:
Rudiy273 years ago
7 0

Answer:R=7.12ohms

Explanation:

Emf (electromotive force) is the source of energy in an electric circuit. It is also the sum of all potential drops across loads in an electric circuit.

Resistance is the opposition to the flow of current in an electric circuit. The presence of a load therefore tends to restrict the current flowing through it.

According to ohm's law, E=IR

E is the emf

I is the current

R is effective resistance (load can be connected in series or parallel)

According to the question, Emf = 1.50V, current(I) =0.17A and terminal voltage V =1.40V

First we need to get the internal resistance (r), from the formula

Terminal voltage V = E -Ir where r is the internal resistance

Substituting

1.40=1.50-0.17r

1.40-1.50=-0.17r

-0.1=-0.17r

r=-0.17/-0.1

r= 1.7ohms

To get R, using E=I(R+r) since the load is in series with internal resistance,we add both to get our effective resistance

1.50=0.17(R+1.7)

1.50=0.17R+0.289

1.50-0.289=0.17R

1.211=0.17R

R=1.211/0.17

R=7.12ohms.

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S=ut-\frac{1}{2}gt^2

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S=12t-\frac{1}{2}(9.8)t^2

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Using equation (2) in equation (1) we get

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7 0
3 years ago
a generator uses loops of area 0.239 m^2, rotating 373 rad/s in a 0.0639 t magnetic field. how many loops must the coil have to
Kaylis [27]

The loops must the coil have to generate a maximum emf of 2500 will be 439.

<h3 /><h3>What is the faraday law of electromagnetic induction?</h3>

According to  Faraday's law of electromagnetic induction, the rate of change of magnetic flux linked with the coil is responsible for generating emf in the coil resulting in the flow of amount of current.

Given data;

Area,A = 0.239 m²

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N = 439 \ turns

Hence, loops must the coil have to generate a maximum emf of 2500  will be 439.

To learn more about the faraday law of electromagnetic induction refer to;

brainly.com/question/26334813

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