What is the relation between load and resistance?

Answer 1

A load is anything that draws current from a source of potential difference. A 'heavy' load will draw a larger current than a 'light' load. A resistor can certainly be used as a load. A low resistance will draw a larger current than a higher resistance and, so, a low resistance represents a high load while a high resistance represents a low load.

Answer 2

Ohm's Law:

Voltage = Current x Resistance

Current = Voltage / Resistance

Resistance = Voltage / Current

Ohm's Law can be used to tell you what the resistance of a circuit is if you happen to know what the voltage across the circuit, and the current through the circuit, happens to be. However, it must be remembered that resistance is notaffected by either voltage or by current. Resistance is only affected by the length, cross-sectional area, and resistivity of the conductor. As resistivity is affected by temperature then a change in temperature will likely result in a change of resistance. In general, the resistance of pure metal conductors increase with temperature, whereas the resistance of most insulators decrease with resistance. So, in the case of a pure metal conductor, if the current causes its temperature to rise, then its resistance will rise too -although this has absolutely nothing to do with Ohm's Law. A practical example of this effect is an incandescent lamp which has a relatively low 'cold' resistance, but a relatively high 'hot resistance'.

Answer 3

Ohm's Law states Voltage = Current x Resistance. If voltage remains constant then current decreases proportionally with an increase in resistance.