A series circuit consists of a battery of negligible internalresistance, a varia

Question

A series circuit consists of a battery of negligible internalresistance, a variable resistor, and an electric motor ofnegligible resistance. The current in the circuit is 2 amperes(A) when the resistance in the circuit is adjusted to 10ohms(). Under these conditions the motor lifts a 1-kilogrammass vertically at a constant speed of 2 meters per second(m/s). (a) Determine the electrical power that is     i. dissipated in the resistor     ii. used by the motor in lifting themass     iii. supplied by the battery (b) Determine the potential difference across      i. the resistor      ii. the motor      iii. the battery The resistor is now adjusted until the mass rises verticallyat a constant speed of 3 meters per second (m/s). The voltage dropacross the motor is proportional to the speed of the motor, and thecurrent remains constant. (c) Determine the voltage drop across the motor (d) Determine the new resistance in the circuit

Explanation / Answer

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