The left side of the armature in an electric motor is pushed down. When the current changes direction, how is the motion of the
armature affected?
It is pulled up on the left side.
It is pulled up on the right side.
It is pulled toward the commutator.
It is pushed away from the commutator

The number of loops in the primary coil divided by the number of loops in the secondary coil equals the voltage in the primary coil divided by the voltage in the secondary coil if the volunteer attached to the primary coil read 100 volts what would the voltmeter attached to the secondary coil read

We know that the law of conservation of energy states that energy can not be created or destroyed. it only changes form. consider this energy transformation diagram. assume that the energy input in this case is chemical potential energy and the useful energy output is kinetic energy, specifically a small fan to keep you cool. the diagram also shows how to calculate the efficiency of the fan. if the law of conservation of energy holds true, explain why the efficiency of the fan is not 100%.

What are some of the main types of forces?