1897 Because he was doing an experiment at that time .
Answer:
The particles that carry charge through wires in a circuit are mobile electrons. The electric field direction within a circuit is by definition the direction that positive test charges are pushed. Thus, these negatively charged electrons move in the direction opposite the electric field.
Explanation:
sun and comet also meteroid
A saw, because wheels and or axles are present in all of the other items. A saw is a wedge, this it does not contain axles or wheels.
Amplitude: the height of the wave
wavelenght: the distance betweeen adjacent crests
period: the time it takes for one complete wave to pass a given point
