Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through...
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![Page 1: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/1.jpg)
Voltage, Current, Resistance and Power
![Page 2: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/2.jpg)
Voltage
Voltage is the ____________________________ through an electric circuit.
Voltage is measured in _____ or ______. In an electric circuit the voltage may be
provided by a battery, a voltage source or a potentiometer.
Cell or BatteryLonger Line indicates
positive
Direct Current Voltage Source
Potentiometer
![Page 3: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/3.jpg)
Electric Current
Any flow of charge is called an _________________________.
Current is measured in ________ (_____ or ___). 1 Amp = 1 _____ In electric circuits, we assume it is ________________ flowing
through the circuit (_____________ current). In reality, it is the ___________________. However in gases
and liquids both positive and negative charges can flow.
![Page 4: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/4.jpg)
Example 1: Electric Current
A steady current of 4.7 A exists in a wire for 180-s.
a) How much total charge passed by a given point in the circuit during this time?
b) How many electrons was this?
![Page 5: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/5.jpg)
Electric Circuits
All voltage sources have a ________ “pole” and a ________ “pole”.
A battery produces current by _________ the electrons with the negative pole and __________ electrons with the positive pole.
Current will only be produced if there is a _____ path (_______) for the electrons to flow from the negative pole to the positive pole.
![Page 6: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/6.jpg)
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Conventional Current
I
When there is no closed path, a circuit,
for the electrons to follow from the
negative pole of the voltage source to the positive pole of the
voltage source, ________________ ____________!!!!
But once the path is closed the electrons are repelled by the negative pole of the voltage source and
attracted to the positive pole of the
voltage source.
![Page 7: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/7.jpg)
Example 2: Electric Circuit
Which of the set-ups below will cause the bulb to light?
![Page 8: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/8.jpg)
Resistors & Resistance
A property of all conductors is their ability to _____ the flow of electric current.
This property is called ____________, R.
The units for resistance are ohms, ___. 1 Ω = 1 ______
Resistor
OR
![Page 9: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/9.jpg)
Ohm’s Law
Georg Simon Ohm discovered that the resistance, R, was _______ in many conductors.
This is known as Ohm’s Law. Materials that obey Ohm’s Law are called
__________. Materials that don’t obey Ohm’s Law are called
__________.
![Page 10: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/10.jpg)
Example 3: Ohm's Law
A light bulb has 120-V across it and carries 0.012-A.
a) What is the resistance of the bulb.
b) Find the current through the bulb if the voltage across it is now 80-V.
c) What voltage would be required to push 1.0-A through the bulb?
![Page 11: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/11.jpg)
Electrical Power
Electical Power is measured in _________
If the electrical Device is an Ohmic Resistor:
OR
![Page 12: Voltage, Current, Resistance and Power. Voltage Voltage is the ____________________________ through an electric circuit. Voltage is measured in _____.](https://reader035.fdocuments.us/reader035/viewer/2022062420/56649f0b5503460f94c1e88d/html5/thumbnails/12.jpg)
Example 4: Electrical Power
A light bulb has 110-V across it and a current of 0.5-A through it
a)What is the power of this bulb?
b)What is the resistance of this bulb?