OpenStudy (anonymous):

How does a resistor affect the current in an electrical circuit?

OpenStudy (aravindg):

Take a simple example. Imagine if there is a small stream and you start putting pebbles in its path. What happens?

OpenStudy (anonymous):

you block it

OpenStudy (aravindg):

Yep. The stream is the current and pebbles represent the resistor.

OpenStudy (anonymous):

so the resistor absorbs all the electricty?

OpenStudy (aravindg):

When you put a resistor in a circuit it blocks the current and hence reduces it. Greater the resistance, lesser the current.

OpenStudy (aravindg):

A resistor absorbs energy and dissipates it as heat. The regulators in fans work on this principle. There we use a variable resistor and it helps us to increase or decrease the current enabling us to control the fan speed.

OpenStudy (anonymous):

thanks

OpenStudy (aravindg):

yw :)

OpenStudy (radar):

Resistors provide control of current. A resistor added to a series circuit will reduce the current. A resistor added to a parallel circuit will increase the total current.|dw:1400026807056:dw|