Work Package 4

Question 1

whats the definition of energy?

Answer 1

the capacity of a body to do work

Question 2

what are three forms of energy and what can they be converted into?

Answer 2

1. heat
2. light
3. electricity
   they can be converted into mechanical work

Question 3

what is the unit of measurement for energy?

Answer 3

joules. joules are equivalent to Newton metres

Question 4

what is the calculation for work done?

Answer 4

work done (joules) = force (newtons) x distance moved (metres)

Question 5

what is the definition of power (mechanical)?

Answer 5

power is the rate of doing work

Question 6

what is the unit of measurement for power?

Answer 6

watts. it is also measured in newton metre/ seconds

Question 7

what does 1 watt equal?

Answer 7

1 joule applied every second

Question 8

what is the calculation for power (mechanical)? (given)

Answer 8

power (watts) = (force (newtons) x distance moved (metres))/ time (seconds)

Question 9

what is the definition of power (for rotational movement)?

Answer 9

power is the rate at which work is performed

Question 10

for a rotating system, whats the calculation for power? (given)

Answer 10

power = torque x angular velocity

Question 11

what is the calculation for power (electrical)?

Answer 11

power = volts x amps

Question 12

what is the calculation for power transmission efficiency?

Answer 12

(power out (watts)/ power in (watts)) x 100%