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Voltage is energy per charge, actually joules per coulomb, so think of voltage as electromotive force that pushes charge around. In fact, another name for voltage is electromotive force. Voltage is manifest as a differential energy between two points, where the energy "wants" to go from the higher energy point to the lower energy point. That is how voltage causes current.
Current is charge flow, actually coulombs per second, which is the same as the ampere.
Ohm's Law defines a unit of resistance called an ohm which is the resistance that one volt will require to push one ampere through. If you do dimensional analysis on the ohm, given the the ohm is the volt divided by the ampere, you discover that the ohm is actually a joule-second per coulomb squared - much easier to just call it an ohm.
Pushing coulombs from one energy level to another involves work. Multiply voltage by current, and you get watts, or joules per second.
Take some time to study this and understand it, and you are well on your way to a basic understanding of electricity 101. I know I answered more than was asked, but some of it was necessary in order to explain things, and the rest was just for the sake of completeness.
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What creates a voltage?
the amount of stuff in it makes it do stuff like voltage. ANSWER: In the sky particles motion creates a potential magnetics and motion will do the same thing. Separation of electric charges (eg by a moving magnetic field as in a dynamo). The more you separate them the higher the voltage. There are chemical ways of doing it, as in a battery.
Will the negative charges move along the ebonite rod if a voltage is applied across it ends?
no
What is true about current?
It is measured in amps. It is related to voltage and resistance by Ohm's Law. It is the flow of electric charges.
How can capacitor smooth or reduce the ripple of the voltage produced by the rectifier?
when rectifier is on, the capacitor is almost transparent (it charges to the voltage provided from the rectifier) when rectifier is off, capacitor holds the peak voltage since it stored a charge during rectifier on time.
Is a UJT a voltage controlled or current controlled device?
voltageCurrent between the two bases of the UJT sets up a voltage gradient in the semiconductor. When the voltage on the emitter of the UJT rises high enough to forward bias the emitter-base junction at the voltage of the interbase gradient where the emitter is located, the UJT "turns on".
