A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

An energy source will supply a constant current into the load if its internal resistance is

A moving coil galvanometer has $$150$$ equal divisions. Its current sensitivity is $$10$$- divisions per milliampere and voltage sensitivity is $$2$$ divisions per millivolt. In order that each division reads $$1$$ volt, the resistance in $$ohms$$ needed to be connected in series with the coil will be -

Thermistors are usually made of