How does resistance affect a circuit?

The relationship between resistance and the area of the cross section of a wire is inversely proportional . When resistance is increased in a circuit , for example by adding more electrical components , the current decreases as a result.

Does a circuit need a resistance?

Circuits need resistors for, for all manner of reasons. Resistors are used to provide biasing voltages that control the gain of amplifiers, they are used to limit currents to safe levels and prevent overheating, they provide a way to sense current and voltage for circuit control and more.

Can a circuit have zero resistance?

Typically the resistance associated with a short circuit is so low as to be considered zero. If a short exists, the minimum power is achieved by having all of the current flow through the short and none of it flowing through any parallel path with non-zero resistance.

What happens if there is no resistance to a short circuit?

Ideally, if there is no resistance ,i.e, short circuit is connected across an dc source, infinite current will flow as I=V/R, and R=0. Practically, if you connect a wire directly across a battery, it will start heating. Resistance of short wire is in the range of Ohms which is very less as compare to resistors.

Can a current pass without any resistance in a circuit?

Of course, any realistic voltage source will also have a limit to the amount of current that it can supply, as Wikipedia will tell you. But if you really minimize the resistance of the total circuit, then you will typically maximize that current. You are saying achieving 0 resistance is not practical.

Where do electrons go when there is no resistance?

If there really were no resistance in the circuit, the electrons would go around the circuit, and arrive back at the beginning of the circuit with as much energy as the potential difference (the voltage).

Why is there resistance in an electric circuit?

In most cases this will damage or destroy the power supply unless it has a current limiting circuit. So even though you do not have an external resistor there is still resistance in the circuit. Even battery’s have internal resistance.