You can find the calculator
at the bottom of this article.
We’ll start with an introduction to this topic.
||The Ohm’s law
(after Georg Ohm) defines the relationship between voltage (V), current
(I) and resistance (R). Power (P) relationships appear as a logic
consequence of the others.
One ohm is the resistance value
through which one volt will produce a current of one ampere. The Ohm’s
formula is V = IR.
Voltage (V) is the
difference in electrical potential
between two points in an electronic circuit, and it is measured in
Current (I) is a
flow of electrons on a conductor, and it is
measured in amperes (A).
determines how much current will flow through
an electrical device. Resistors are used to control or limit voltage
current levels. A high resistance will allow a small current to flow. A
resistance will allow a larger current to flow. Resistors are measured
Power (P) is the
voltage multiplied by the current, and it’s
measured in watts (W).
law Pie Chart
Let’s say that a 12V car
battery is connected to a 3 ohm
light bulb. What is the voltage measured at the light bulb?
We can use our calculator
V = 12.0 V
R = 3.0 ohms
I = 4.0 A
Our calculator can also
be used to find out the equivalent
resistor of up to four resistors
in parallel. For example, three 20-ohm parallel
resistors are connected across a 120 V power source. What is the
We use the section on
parallel resistors and enter
R2 = 20 ohms
R3 = 20 ohms
we learn that the
equivalent resistor is Rt = 6.7 ohms.
Now, we use the formula I
= V/R and enter the known values
of voltage and resistance
R = 6.7 ohms
and we discover that the
total current flowing is I = 17.91
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