OHM LAW by alicejenny

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• pg 1
```									Forging new generations of engineers
Ohm’s Law


And now, a word from Mr. Ohm
In the early 1800’s, Georg Ohm
defined the fundamental relationship
between: Voltage (E), Current (I)
and Resistance (R) in electric
circuits.
His experiments represent the
beginning of circuit analysis.
Today, the Ohm’s Law
formula is used by engineers…

…when designing circuits.
Because electricity is very
predictable, circuit performance
can be analyzed with
mathematical formulas such as
Ohm’s Law before the circuits
are even constructed!
Ohm’s Law
expresses the

E
relationship
between
Voltage (E),
Current (I),

I       R
and
Resistance (R)
in circuits.
E=IxR
When any
two of the
Ohm’s Law                   E?
Voltage
variables
are known,
?                 ?
I         R
the third
can be         Current      Resistance
calculated
mathematically.

R=E/I        I =E / R
In this lab activity, Ohm’s
Law will be investigated by
assembling two circuits. The
The test results will then be
and
circuits will be tested Law
verified using Ohm’s
Resistance, Voltage, and
calculations.
Current will be measured.
When making circuit measurements, it is
The to always Units are…
importantEquivalentwork in Equivalent
Units.

K                V             mA
The following slides illustrate
the correct way to make test
measurements in the Ohm’s
Law Lab activity.
Series Circuit
Resistance Measurement
Start at 2K and adjust to higher range as necessary.

Reading must be expressed in K
Series Circuit
Voltage Measurement

Meter is connected in Parallel with Circuit
Set meter range to 20 Volts

Reading must be expressed in    V
Series Circuit
Current Measurement

Meter is connected in Series with Circuit
Start at 200 mA and adjust to lower range as necessary.

Reading must be expressed in mA
Parallel Circuit
Resistance Measurement
Start at 2K and adjust to higher range as necessary.

Reading must be expressed in K
Parallel Circuit
Voltage Measurement

Meter is connected in Parallel with Circuit
Set meter range to 20 Volts

Reading must be expressed in    V
Parallel Circuit
Current Measurement

Meter is connected in Series with Circuit
Start at 200 mA and adjust to lower range as necessary.

Reading must be expressed in   mA
With test data inserted to the right of the equal
sign, you will solve Ohm’s Law equation for…

V                                         V

mA                                     mA

                                         

… and last, but not least, don’t forget to try the
Challenge Problem
The End

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