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Resistance and Ohm's Law
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What is resistance?
Electrical resistance is property of a substance that slows down the movement of electrons and converts electrical energy into other forms of energy.
What is resistance?
For instance, the resistance of the tungsten filament in a light bulb is more than 400 times greater than the resistance of copper connecting wires.
What is resistance?
When current moves through the high-resistance filament converts much of the energy carried by the current into light and heat.
What is resistance?
When the same current moves through the copper wire, the amount of energy converted into heat is much smaller. The unit used for measuring resistance is the ohm. An ohmmeter can be used to measure resistance.
How is resistance related to voltage and current?
Voltage, current, and resistance are closely related.
How is resistance related to voltage and current?
1. current is the movement of electrons (charges) through a conductor.
How is resistance related to voltage and current?
2. Voltage is what makes the electrons move through the conductor.
How is resistance related to voltage and current?
3. Resistance works against and slows down the motion of the electrons
How does Ohm's law relate voltage, current, and resistance?
Ohm's law is a mathematical equation that shows how voltage, current, and resistance are related:
How does Ohm's law relate voltage, current, and resistance?
resistance = voltage over current or R= V over I
How does Ohm's law relate voltage, current, and resistance?
Where R stands for resistance, V stands for voltage, and I stands for current.
How does Ohm's law relate voltage, current, and resistance?
You can rewrite this equation to solve for any of the variables in it. Thus:
How does Ohm's law relate voltage, current, and resistance?
voltage = current x resistance (V=IR); and Current = voltage over resistance (I= V over R)
What is a resistor?
A resistor is a component in a circuit that has a specific resistance. Resistors are used to control current or voltage to suit the needs of other electric devices in the circuit.
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