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Agata [3.3K]
3 years ago
10

Electrical power is transmitted from power plants to consumers–sometimes over very long distances– through conducting power line

s that are either underground or suspended overhead on poles. in lab and tutorial, we generally treat wires as having essentially 0 resistance. however, over a sufficiently long distance, the resistance of a conducting wire becomes significant. why is this?
Physics
1 answer:
sergeinik [125]3 years ago
7 0
There is more wire to travel through,farther distance, and a higher possibility of other disruptions.  Please Mark Brainliest!!!
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A battery with an emf of 24.0 V is connected to a resistive load. If the terminal voltage of the battery is 16.1 V and the curre
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Answer:

2.03 Ω

Explanation:

EMF: This can be defined as the potential difference of a cell when it is not delivering any current. The S.I unit of Emf is Volt.

The formula of emf is given as,

E = I(R+r)............................ Equation 1

Where E = Emf, I = current, R = External resistance, r = internal resistance.

Make r the subject of the equation

r = (E-IR)/I........................ Equation 2

Note: From ohm's law, V = IR.

r = (E-V)/I........................ Equation 3

Where V = Terminal voltage

Given: E = 24 V, I = 3.9 A, V = 16.1 V.

Substitute into equation 3

r = (24-16.1)/3.9

r = 7.9/3.9

r = 2.03 Ω

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2 years ago
A real battery with internal resistance 0.460 Ω and emf 9.00 V is used to charge a 56.0-µF capacitor. A 21.0-Ω resistor is put i
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t = 56×10^-6 × 21

t = 1176×10^-6

t = 1.176×10^-3 s

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