Work and Energy (CH2)

Question 1

What is the standard measurement for all forms of energy?

Answer 1

Joules [(Kg x M²)/s²] or J

Question 2

When do we say that work has been done in a system?

Answer 2

When the volume of the system has changed due to applied pressure (W = PΔV). Work may also be expressed as the area under a pressure-volume curve.

Question 3

What is the standard measurement for power?

Answer 3

• Watts (Joules/Second) or W - P = W/t - P = ΔE/t