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by BlastRoom
Trace how generators, motors, and transformers use electromagnetism to transfer or convert energy.
#physics
40 questions
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In the generator figure, what is the job of part B, the pair of slip rings?
In the generator figure, part C is a pair of brushes touching the slip rings. What do the brushes do?
In the motor figure, part B is the split-ring commutator. What is its job?
In the motor figure, part C marks the brushes. Which statement best describes their role?
In the motor figure, part A is the rectangular coil between the magnet poles. Why must current pass through this coil?
In the transformer figure, part C is the iron core. What is its main job?
In the transformer figure, part A is the primary winding. What happens there during normal operation?
Use the labeled transformer figure. Using Vs/Vp = Ns/Np, what is Vs?
The diagram shows a transformer with its coils and input labeled. Using Vs/Vp = Ns/Np, what is Vs?
A transformer is shown with the primary side and secondary side labeled. Using Vs/Vp = Ns/Np, what is Vs?
Refer to the labeled transformer diagram. Using Vs/Vp = Ns/Np, what is Vs?
The figure gives the transformer input, output label, and coil turns. Using Vs/Vp = Ns/Np, what is Vs?
A hand-cranked emergency radio uses a small generator to charge its battery. Which energy conversion happens in the generator?
An electric drill spins a bit when plugged into an outlet. Which energy conversion is done by the drill's motor?
A laptop charger contains a transformer that changes 120 V a.c. to a lower potential difference. What is the transformer's main energy transfer?
In a hydroelectric plant, falling water turns a turbine connected to a generator. What energy conversion does the generator perform?
A ceiling fan has an electric motor inside its housing. Which conversion best describes the motor's useful output?
A wind turbine turns a generator when wind spins its blades. Which conversion happens in the generator?
A blender's blades spin because a motor turns the shaft. What conversion occurs in that motor?
Steam pushes turbine blades in a power station, and the shaft turns a generator. What conversion does the generator carry out?
A neighborhood transformer reduces the potential difference before electricity enters homes. What energy transfer best describes it?
A car alternator is driven by the engine and supplies current to recharge the battery. Which conversion happens in the alternator?
Which principle explains why rotating a coil in a magnetic field can produce an induced potential difference?
Which principle makes a simple electric motor turn?
A transformer has two coils wound on the same iron core. Which principle lets energy transfer from one coil to the other?
A transformer is connected to a steady 12 V battery and gives no continuous output. Why?
Why do long-distance transmission lines use very high potential difference and relatively low current?
A step-up transformer raises the potential difference from 12 V to 1200 V. What must happen to current in an ideal transformer delivering the same power?
A transformer has more turns on the secondary coil than on the primary coil. What kind of transformer is it?
A transformer has fewer turns on the secondary coil than on the primary coil. What happens to the alternating output potential difference?
An electric toothbrush can charge while sealed in plastic, with no metal contacts exposed. Which idea best explains the charging base?
In a loudspeaker, a current in a voice coil sits in the field of a permanent magnet and moves a cone. Which device principle is being used?
In a dynamic microphone, sound moves a coil near a magnet and a small signal appears. Which device is it most like?
A generator becomes harder to turn when a lamp is connected to its output. Which idea best explains the extra resistance to turning?
An ideal transformer has Vp = 120 V, Np = 400 turns, and Ns = 2000 turns. What is the secondary potential difference?
A transformer steps 240 V a.c. down to 12 V a.c. If the primary has 1000 turns, how many turns should the secondary have?
An ideal transformer takes 20 kV at 200 A on the primary and sends power at 400 kV on the secondary. What is the secondary current?
A transformer has a turns ratio Ns/Np = 1/4 and a primary potential difference of 120 V a.c. What is the secondary potential difference?
An ideal transformer changes 120 V a.c. to 48 V a.c. The secondary has 80 turns. How many turns are on the primary?
An ideal transformer has 120 V and 2.0 A on its primary. If the secondary output is 12 V, what is the secondary current?
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Celsius, Kelvin and Absolute Temperature
50 questions
