A 120VAC electric heater has two resistive heating elements that can be switched separately in and out, in series or parallel. Find the values of the two resistors if the minimum power drawn by the heater is 300 watts and the maximum is 1200 watts.

The values of the two resistors are 48 ohms and 12 ohms.

Explanation:

Power (P) = Voltage^2 (V^2) ÷ Resistance (R)

R = V^2 ÷ P

The minimum power drawn by the heater is 300 watts

Voltage is 120 V

R = 120^2 ÷ 300 = 14,400÷300 = 48 ohms

The maximum power drawn by the heater is 1200 watts

R = 120^2 ÷ 1200 = 14,400 ÷ 1200 = 12 ohms

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force