Podcast
Questions and Answers
What is an example of useful work being done by devices inside a black box?
What is an example of useful work being done by devices inside a black box?
- Generating heat energy
- Rotating the stator of a motor (correct)
- Creating hysteresis effects
- Creating eddy currents in transformers
When can we be certain that power is entirely converted into heat energy?
When can we be certain that power is entirely converted into heat energy?
- When the Ohm's law is substituted into the generalized power equation (correct)
- When driving chemical reactions
- When generating radio waves
- When creating hysteresis effects
What is the common term used for the power lost due to heating in a system?
What is the common term used for the power lost due to heating in a system?
- Joule heating (correct)
- Ohmic cooling
- Ohmic loss
- I2R cooling
Why is assuming a black box is a 100-Ω resistor generating heat energy an erroneous assumption?
Why is assuming a black box is a 100-Ω resistor generating heat energy an erroneous assumption?
What term is used to describe the heating caused by the resistance of a material to the flow of an electric current?
What term is used to describe the heating caused by the resistance of a material to the flow of an electric current?
Which type of energy conversion does Joule heating represent?
Which type of energy conversion does Joule heating represent?
What would happen if all power drawn by a black box was converted only into useful work without any losses?
What would happen if all power drawn by a black box was converted only into useful work without any losses?
What does Ohm’s law describe in relation to the generalized power equation in circuits?
What does Ohm’s law describe in relation to the generalized power equation in circuits?
What happens when people treat any load (black box) as a resistor during circuit analysis?
What happens when people treat any load (black box) as a resistor during circuit analysis?
What causes eddy currents in transformers that contribute to power loss?
What causes eddy currents in transformers that contribute to power loss?
