The illustration below shows an example of energy changing forms. Which changes in energy form are illustrated in the diagram?

a
electrical --> sound --> light and mechanical
b
sound --> mechanical --> light and electrical
c
mechanical --> light --> sound and electrical
d
light --> electrical --> mechanical and sound

answer: f

explanation: g

the independent variable, or the one that is intentionally manipulated is the speed.

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