Rheostats are pure resistances with a provision to vary the resistance connected in the circuit with a moving contact. Resistance do not have polarities
Answer: "converted"
Energy can be converted from one form to another
Explanation:
The law of conservation of energy states that energy can neither be created nor destroyed but converted from one form to another.
For instance:
- an electric generator convert mechanical energy to electrical energy
- a solar panel system convert solar energy to electrical energy.
- an electric pressing iron convert electrical energy to heat energy
Thus, energy can be converted from one form to another
Answer:
Upper disk rotates at a constant angular velocity. The velocity at any height from stationery disk, say at x metres
where v is tangential velocity at radius r from the centre of disk
The radial component of velocity is given as
The z component of velocity is also given as
W=0
Total velocity, 
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