If we switch on a light bulb, it seems to glow instantly. However, we all know that current is not instantaneous as it too must flow through the wire at a finite speed.
What causes electricity to flow?
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Like the water flowing from high altitude (a tank) to some thing at low altitude (our shower), the current also flows from high potential areas to low potential areas. Potential difference (voltage) is the cause, current (flowing) is the effect and resistance is just something that restricts the flow. (Resistance is due to the nature and dimensions of the material)