Solution: At what rate is the current changing at the instant when the resistance is 6 ohms?

A standard cell has an emf “E” of 1.2 volts. If the resistance “R” of the circuit is increasing at the rate of 0.03 ohm/sec, at what rate is the current “I” changing at the instant when the resistance is 6 ohms? Assume Ohm’s law E = IR.

At what rate is the current changing at the instant when the resistance is 6 ohms?

Problem Statement: EE Board October 1993

A standard cell has an emf “E” of 1.2 volts. If the resistance “R” of the circuit is increasing at the rate of 0.03 ohm/sec, at what rate is the current “I” changing at the instant when the resistance is 6 ohms? Assume Ohm’s law E = IR.
  • A. -0.002 amp/sec
  • B. 0.004 amp/sec
  • C. -0.001 amp/sec
  • D. 0.003 amp/sec

Problem Answer:

The current changing at -0.001 amp/sec

Solution:

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