Question

What is the driving force in a working Electrical Circuit?
A. Voltage difference
B. current
C. temperature difference
D. chemical imbalance

Answer 1

Hint: To solve this question, we will need to know the basics theory related to the electric circuit. As we know When we talk about electrical circuits there are three main quantities to consider - voltage, current and resistance.

Formula Used:
 Relation between – voltage(V) and current(I).
${\text{V = I}} \times {\text{R}}$

Complete step by step answer:
Electric Current is the flow of electricity within the electrical circuit. For better understanding if you connect a lamp to the socket, electricity will flow through the wires and be converted into heat and light in the lamp.
Voltage is the driving force which makes every electrical network working feasible. In general, this is probably the most familiar quantity.
To explain current and voltage, a water analogy is used. Voltage difference is the equivalent to water pressure and current similar to the flow of water through pipes.
As we know, electrical circuits have mainly three main quantities to consider – voltage(V), current(I) and resistance(R). And If we know the value of two of these parameters, we can always get the value of the third quantity.
${\text{I = }}\dfrac{{\text{V}}}{{\text{R}}}$
When Voltage is applied across a resistor then randomly moving free electrons particles start to move towards the positive terminal and due to force applied by the electric field generated due to voltage difference. Therefore, a start to Current Flows from High Voltage to Low Voltage.
Voltage is cause and current is effect.
Hence the correct option is A.

Note: If we have a good idea of voltage, current and resistance then we can easily make sense of how electric circuits work. for better understanding if we consider that the resistance of the human body is approximately 1000 Ω. If you accidentally come into contact with a live 230 V conductor, the current flowing through your body would be $\dfrac{{230}}{{1000}}$= 0.23 A.