Aconstant voltage is applied across a circuit element. if the resistance of the element is doubled, what is the effect on the power dissipated by this element? the power dissipated is reduced by a factor of 2. the power dissipated remains constant. the power dissipated is doubled. the power dissipated is quadrupled. the power dissipated is reduced by a factor of 4.

The power dissipated is reduced by a factor of 2

Explanation:

The power dissipated by a resistor is given by:

where

I is the current

R is the resistance

by using Ohm's law, , we can rewrite the previous equation in terms of the voltage applied across the resistor (V):

In this problem, the resistance of the element is doubled, while the voltage is kept constant. So we have while V remains the same; substituting into the formula, we have:

so, the power dissipated is reduced by a factor 2.

uranium fissions/breaks up giving out energy and neutrons

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27