An Electric Device, Which Heats Water by Immersing a Resistance

question 26

Multiple Choice

An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)

• A) 0.94 Ω
• B) 0.81 Ω
• C) 0.58 Ω
• D) 0.69 Ω
• E) 1.5 Ω

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Definitions:

Muscle Contraction

The process where muscle fibers shorten and generate force as a result of interactions between actin and myosin filaments.

Synergist

A muscle that assists another muscle in accomplishing a movement by helping reduce undesired motion or by stabilizing joints.

Prime Mover

A prime mover, in anatomy and physiology, refers to the muscle that plays a leading role in performing a particular movement by contracting, while other muscles may play supportive or stabilizing roles.

Fixator

A muscle or muscle group that stabilizes the origin of another muscle to enable effective action of the muscle.