why are resistors needed in a circuit ? how do they help if the amount of current we supply is accurate ?

Answer 1

Because that's how you control the current, with resistors.

If you have no resistors, then your current will go so high that a fuse is blown or a breaker is opened.

V = IR

Do arrow analysis. R(way down) = I(way up) for a constant V.

The amount of current drawn is inversely proportional to resistance.

So when you say "if the amount of current we supply is accurate". The only way to do that is will resistors. You can hook up a variac and change the voltage, but resistance is still the controlling factor for current.

Answer 2

Resistors are electrical component that opposes the flow of either direct or alternating current, employed to protect, operate, or control the circuit. Voltages can be divided with the use of resistors, and in combination with other components resistors can be used to make electrical waves into shapes most suited for the electrical designer's requirements.

All resistors possess a finite shunt capacitance across their terminals, leading to a reduced impedance at high frequencies. Resistors also possess inductance, the magnitude of which depends greatly on the construction and is largest for wire-wound types.

Direct-current (dc) ammeters employ resistors as meter shunts to bypass the major portion of the current around the low-current elements. These high-accuracy, four-terminal resistors are commonly designed to provide a voltage drop of 50–100 mV when a stated current passes through the shunt.

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Answer 3

Resistors are used to limit the electric current in the circuit.
Resistors are essential components in almost every electric and electronic circuits. We cannot make constant current or constant voltage without resistors. Semiconductor are used as resistor in most integrated circuits to save space.
In fact , resistors are like a valve in our home water system to control the flow of water at desired rate.