The easiest way to measure ohms is with an ohm meter, which is typically part of an electrical multi-meter. A multi-meter can read many different kinds of electrical variables: AC voltage, DC voltage, amps, and ohms among them.
Ohm's law :
I=V/R
(I = current in amperes, V = potential in volts, R = resistance in ohms)
Using Ohm's law and the mathematical laws of equality, one can calculate the value of any one of these three properties given the other two are known.
A 40watt 120volt light-bulb draws 0.335 amps (Watts = Amps x Volts). Using Ohm's law we can find the resistance value of said light-bulb:
I=V/R = R=V/I = R=120/0.335 = R=358
This will work with any electrical circuit. (Note, a 120v household light-bulb is designed to use resistance to produce heat, when the filament is heated resistance is greatly increased. The watts rating on a bulb is for nominal running tepmeratures. When cold, the resistance across the filament is much less.)
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Resistance is measured in the standard units of ohms using the omega symbol
You look at the color bands. There are three or four bands, sometimes five. The first two bands indicate the first two digits of the value, the third band indicates the multiplier, the fourth band indicates the tolerance, and the fifth band is used for temperature coefficient.
0 - Black
1 - Brown
2 - Red
3 - Orange
4 - Yellow
5 - Green
6 - Blue
7 - Violet
8 - Grey
9 - White
Take the first two bands and write the number down. Lets say the resistor was red - violet - orange. You would write down 27. The third band would be the multiplier, in the form 10N, so you would write down that many zeros after the 27, giving you 27000, or 27 KOhms.
If the third band is gold is silver, then the multiplier is a divider, gold being 0.1 and silver being 0.01, so a brown - red - gold resistor is 1.2 ohms, while a brown - red - silver resistor is 0.12 ohms.
If the fourth band is missing, the tolerance is 20%. If it is silver, the tolerance is 10%. If it is gold, it is 5%.
These are the basics. For more information, please see the Related Link below.
A resistor use a color code or an alpha-numeric code to identify its resistance. The color code is a series of colored bands, the sequence of which identify the value of its resistance (you can check this out, in detail, on the internet). The alpha-numeric code uses letters to identify the multiplication factor (e.g. R = x1, K = x1000, M = x1 000 000) and the position of the letter to indicate the decimal point. For example,
R10 = 0.10 ohm
1R0 = 1.0 ohm
10R0 = 10.0 ohm
etc.
E = I x R
Thus R (in ohms) = E (in volts) / I (in amps)
Resistance = Volts / Current
a circuit with many resistances.
It makes the current bigger
Sugar is not used in electrical circuits.
I think so
If electric wires weren't covered with insulation, there would be short circuits.
Using superposition theorem.
ammeter is a measurement tool used to calculate the current flow in electric and electronic circuits
Voltage (volts) divided by Resistance (ohms). For AC circuits the resistance part of this formula is replaced by "impedance" which involves the effects of capacitors and inductors as well.
Loose contacts can act like on/off switches in the circuit as they make/break connection. In sensitive circuits, the added resistance during contact may also affect the performance of the circuit itself, particularly if Resistance is part of the circuit design.
V = I x R V = voltage, I = Current, R = Resistance or it can be calculate like this V = P / I V = Voltage, P = Electric Power, I = Current
Colin D. Simpson has written: 'Principles of DC/AC circuits' -- subject(s): Electronic circuits 'Introduction to Electric Circuits and Machines' -- subject(s): Electric circuit analysis, Electric circuits, Electric machinery 'Industrial electronics' -- subject(s): Industrial electronics
An electric circuit is just a circle of electric wires who connect all sorts of resistances (everything that uses electricity is called a resistance) and an electric source. Example: a battery connected to three lights: (each R represents a bulb) I hope this helps!
no we not use resistance in place of diode.
J. Richard Johnson has written: 'Electric circuits' -- subject(s): Electric circuits
Edward Nicholas Pink has written: 'The electric and magnetic circuits' -- subject(s): Electric circuits, Electric currents, Magnetism
V = I x R V = voltage, I = Current, R = Resistance or it can be calculate like this V = P / I V = Voltage, P = Electric Power, I = Current
a circuit with many resistances.