What was the horsepower calculated? Does this make sense?
The horsepower calculated when running up the stairs was 0.67 hp. This makes sense as 1 hp was originally defined to be the approximate amount of work a strong dray horse could do while lifting coal for one minute (The Editors of Encyclopædia Britannica, n.d). It is, therefore, reasonable to assume that a human could do 67% of this amount of work for a shorter amount of time.
Generator
What would happen to the force required to turn the generator if the bulb was taken out? Why?
Of the bulb was taken out of the generator then the amount of work required to turn the generators handle would be decreased because generators create electrical energy by creating a changing magnetic field. This works by moving a copper coil in a permanent magnetic field. The induced field created in the copper coil opposes the permanent one (according to Lenz's Law). These two opposing magnetic fields create the force that resists the rotation of the coils. When the light bulb is taken out no current can flow through the coil (Faraday's Law) so no opposing magnetic field is created.
Hot Plate
Why didn’t the power you calculated match the power stated on the hot plate? …show more content…
Since the beaker only covered roughly a quarter of the surface area of the hot plate, only approximately a quarter of the thermal energy is transferred to the beaker and by extension the water. The other three-quarters of the thermal energy is transferred to the air. A small fraction of this hot air contacts the beaker before rising which would explain why the calculated energy transferred into the water was slightly over 25% of the total available. This is also demonstrated as the warmer air could be felt around the hot plate during the
The horsepower calculated when running up the stairs was 0.67 hp. This makes sense as 1 hp was originally defined to be the approximate amount of work a strong dray horse could do while lifting coal for one minute (The Editors of Encyclopædia Britannica, n.d). It is, therefore, reasonable to assume that a human could do 67% of this amount of work for a shorter amount of time.
Generator
What would happen to the force required to turn the generator if the bulb was taken out? Why?
Of the bulb was taken out of the generator then the amount of work required to turn the generators handle would be decreased because generators create electrical energy by creating a changing magnetic field. This works by moving a copper coil in a permanent magnetic field. The induced field created in the copper coil opposes the permanent one (according to Lenz's Law). These two opposing magnetic fields create the force that resists the rotation of the coils. When the light bulb is taken out no current can flow through the coil (Faraday's Law) so no opposing magnetic field is created.
Hot Plate
Why didn’t the power you calculated match the power stated on the hot plate? …show more content…
Since the beaker only covered roughly a quarter of the surface area of the hot plate, only approximately a quarter of the thermal energy is transferred to the beaker and by extension the water. The other three-quarters of the thermal energy is transferred to the air. A small fraction of this hot air contacts the beaker before rising which would explain why the calculated energy transferred into the water was slightly over 25% of the total available. This is also demonstrated as the warmer air could be felt around the hot plate during the