Solved exercise · level 3 of 5

Rheostat between a generator and a load

Skills: Calculate

Statement

A load (E′ = 24 V, r′ = 4 Ω) is fed by a generator (E = 45 V, r = 1 Ω). What resistance must the series rheostat present so that I = 2 A?

Parametric exercise: the values change with every draw; these are one example.

2 hints from Bastaya available in the lab

Solution

E − E′ = (r + r′ + R) · I → R = (E − E′) / I − r − r′ = (45 − 24) / 2 − 1 − 4 = 5.5 Ω.

Other exercises of the chapter

Generalised Ohm's law: missing EMF level 4
Two accumulators in opposition level 3
Limiting the charging current level 3
Two cells, one motor, two resistors level 4
Two cells in opposition level 3
Set the rheostat of a motor level 4

Simulated time00:00:00

Q = I·t-

W = P·t-

Rheostat between a generator and a load

Statement

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Circuit diagram CEI 60617

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