Physics
JannD1
20

What happens to the current in a circuit if the resistance triples? If the voltage triples?

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(1) Answers
Cheer11

(Example 1 )  If the Voltage that furnishes the current is an ideal (no internal resistance) Voltage source. Then;  V/R = i  V/2R = i/2 If external resistance doubles, current reduced to 1/2 of original value  V/3R = i/3 If external resistance triples, current reduced to 1/3 of original value  (Example 2)  But if the Voltage that furnishes the current is a practical [contains an internal resistance (Ri)] Voltage source. Then the current is a function of the Voltage source`s internal resistance, which does not double nor triple, plus the external resistance which is being doubled and tripled.  V/(R + Ri) = i  V/(2R + Ri) = greater than i/2 but less than I.  V/(3R + Ri) = greater than i/3 but less than i/2

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