What causes an electric current in a wire?
1 answer:
Well let's analyse.
First we know Ohm's law of resistance that states:
Where R is resistance, U is voltage and I is current.
If we express current we get:
Because resistance cannot be equal to 0 (violation of mathematical law) the only thing that may cause current being zero is voltage.
Which means that as long as your voltage is bigger than 0V then there will be current (if we are talking about AC).
So to answer the question: Electric current is caused by voltage and regulated by resistance.
Hope this helps.
r3t40
You might be interested in
Assuming it starts at rest, the roller coaster only has potential energy at the top of the hill, which is
When it reaches the bottom, its potential energy will have converted to kinetic energy,
where is its velocity at that point. By the law of conservation of energy, assuming no loss of energy due to other sources (e.g. sound, heat), we have
Answer:
2.75 N
Explanation:
Given that,
Box A has a mass 21.0 kg and box B has a mass 8.0 kg.
A horizontal force of 100N is exerted on box A.
Let a be the acceleration of the system. Using second law of motion,
Now applying Newton's second law to box B. So,
So, 2.75 N is the force that box A exerts on box B.