The equivalent resistance for a group of parallel resistors is

Explanation:

Resistors are said to be in parallel when they are connected to points at the same voltage; this means that the potential difference is the same across each resistor:

(2)

As a result, the current splits through the different branches, and the total current is the sum of the individual currents through each resistor:

(1)

we can rewrite (1) by using Ohm's law:

and since by eq.(2) the potential difference through each resistor is the same, the last equation becomes

which is the expression that gives the equivalent resistance for a group of parallel resistors.

it has to be b, about 97 percent.

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.