Ohm's Law Electrical Engineering Interview Question and Answer
OHM’s Law Theory
- What is Ohm’s law theory
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- Electrical basic theory
- Ohm’s law basic
- What is Ohm’s law and what does it mean?
- What is ohm’s law formula?
- Define ohm’s law formula?
- Ohm’s law formula with examples
- How to calculate current?
- How to calculate voltage?
- What is formula for resistance of conductor?
- Ohm’s law calculator
- What is formula for voltage?
- What is formula for current?
- How do you calculate current?
- Why ohm’s law is important?
- How do you use Ohm’s law?
- What is Ohm’s law Definition?
- What is Ohm’s law statement?
- Define ohm’s Law?
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- What is definition of Ohm’s law?
- What is Ohm’s law theory?
- What is ohm’s law triangle?
- What is Ohm’s law circle?
Answer: We all know that when a battery is
connected across the load, the current starts flowing through this conductor.
We do not how much current will flow when a certain potential applied across
the terminal of a battery. The answer to this question was given by German
Physicist George Simon Ohm.
He showed by elaborate experiments that the current
through metallic conductor is directly proportional to the potential difference
across its ends. This fact is known as Ohm’s law which states that
“The current
flowing through a conductor is directly proportional to the potential
difference across its end with condition that physical state such as temperature
etc remains constant”.
Ohms lay
formula is given below,
I ∝ V
V = RI ----------- (1)
Equation 1
is the general form of Ohm’s Law. V represents the voltage. “I” is the symbol
of current. R is proportional constant. R is called the resistance of the
conductor. The value of resistance depends upon the nature, dimensions and physical
status of conductor. It is factor which resists the motion of free electrons. When
voltage is applied across the conductor, current starts flowing through the
conductor. If the applied voltage will increase, current through conductor will
also increase.
The unit of
resistance is Ohm. It symbol is Ω. As V is in volts and I is measured in amperes.
There is millions of material in the
world. The question arises in our mind that how we will know that which
conductor will obey ohm’s law. To answer this question, ohm law graph is
developed to check the behavior of different conductor. A conductor which
strictly obey ohms law have straight line graph between voltage and current.
This means that their resistance is constant.
However some devices are available
which does not obey ohm’s law are called Non-Ohmic. The examples of Non ohmic
devices are filament bulbs and semiconductor devices.
The circle of ohm’s law is simple and
helps you to find any value of current, voltage or resistance with little
calculation.
The triangle is simply based on its
formula. It helps you to find required value of any problem. It also helps you
to remember easily ohm’s law formula.
Ohm’s law examples with calculations
are given below.
1-
A battery of 12v
is connected across a circuit with an LED and series resistance. The total
resistance of circuit is 1.1KΩ. Find the value of current passing through LED?
Solution:
Total
Voltage supplied by the battery = 12V
Total
resistance in the circuit = 1100Ω
Current passing
through LED =?
By using
Ohm’s law formula:
V = IR
Or
I = V/R
I =
12V/1100Ω
I= 0.01 A
I = 10 mA ----------- Answer
2-
Find the
resistance of load connected with a voltage source of 10V with 2uA current
passing through it?
Solution:
Total Voltage
supplied by the battery = 10V
Total resistance
of load =?
Current
passing through load= 2uA
By using
Ohm’s law formula:
V = IR
Or
R= V/I
R= 10V/2uA
R= 5 MΩ ----------- Answer
These are two examples which will help
you to understand the concept of Ohm’s Law. There are multiple questions which
different peoples will demand from you. The answer to all of them is same. If
you still find such a question, you can comment below to help us; we will make
answer your question in given time.
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