Bellringer A standard household outlet has a voltage of what?
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Transcript of Bellringer A standard household outlet has a voltage of what?
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BellringerA standard household outlet has
a voltage of what?
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Electric Circuits
Part I
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Ohm’s Law
•Current, voltage, and resistance are related to one another. The relationship among resistance, voltage, and current is summed up in Ohm’s Law.
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Ohm’s Law• Ohm’s Law states that the resistance of
most conductors does not depend on the voltage across them.
• Changing the voltage in a circuit changes the current but will not change the resistance.
• Ohm concluded that conductors and most other devices have a constant resistance regardless of the applied voltage.
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Ohm’s Law•The equation for Ohm’s Law is:
• The units in the equation are:
Ohms (Ω) = Volts (V) ÷ Amps (A)
CurrentResistance =
Voltageor R=V/I
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Ohm’s Law•You can rearrange Ohm’s Law to
find voltage with this equation:
Voltage = Current X Resistance
or
V=IR
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Ohm’s Law
If a circuit has a resistance of 30.5 ohms and a current of .05 amps, what is it’s voltage?
1.525 volts
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Ohm’s LawThe brake light on an automobile is connected to a 12-volt battery. If the resulting current is 0.40 amps, what is the resistance of the brake light?
30 Ω
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Features of a Circuit
•Circuits have devices that are run by electrical energy.
•A circuit has a source of electrical energy.
•Electric circuits are connected by conducting wires.
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Features of a Circuit
•Radios, appliances, and light bulbs are examples of electrical devices. All these devices resist the flow of electrical energy. As a result, electrical devices are known as resistors.
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Features of a Circuit
•Sources of electrical energy in a circuit include batteries, generators, and electric power plants. When you plug a radio into a wall socket, the source of electrical energy is your local electric plant.
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Features of a Circuit
•Conducting wires complete the path of an electric circuit. Wires allow charges to flow from the energy source to the electric device and back to the energy source.
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Features of a Circuit
•Often, a switch is placed in an electric circuit. With a switch, you can turn a device on or off by opening or closing the circuit.
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Circuit Diagram
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Circuit Diagram