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Questions and Answers
How does the resistance of a metallic conductor typically change with increasing temperature?
How does the resistance of a metallic conductor typically change with increasing temperature?
- Resistance remains constant.
- Resistance increases linearly. (correct)
- Resistance decreases linearly.
- Resistance increases exponentially.
Which statement accurately describes the relationship between voltage (U), current (I), and resistance (R) in a circuit, according to Ohm's Law?
Which statement accurately describes the relationship between voltage (U), current (I), and resistance (R) in a circuit, according to Ohm's Law?
- Voltage is inversely proportional to current and resistance.
- Current is directly proportional to voltage and inversely proportional to resistance. (correct)
- Resistance is directly proportional to voltage and inversely proportional to current.
- Current is directly proportional to resistance and voltage.
When examining the behavior of a light bulb (Glühlampe), what happens to its resistance as the applied voltage increases, assuming it heats up?
When examining the behavior of a light bulb (Glühlampe), what happens to its resistance as the applied voltage increases, assuming it heats up?
- Resistance decreases due to increased electron flow.
- Resistance increases due to the filament's temperature rise. (correct)
- Resistance fluctuates randomly with voltage changes.
- Resistance remains constant as voltage does not affect it.
A circuit has a voltage of 12V and a resistance of 4 ohms. What is the current in the circuit?
A circuit has a voltage of 12V and a resistance of 4 ohms. What is the current in the circuit?
Given a wire with a resistance $R$, how would the resistance change if the length $l$ of the wire is doubled and the cross-sectional area $A$ is halved?
Given a wire with a resistance $R$, how would the resistance change if the length $l$ of the wire is doubled and the cross-sectional area $A$ is halved?
What is the standard SI unit for electrical power?
What is the standard SI unit for electrical power?
If the voltage across a resistor is doubled while the resistance remains constant, what happens to the power dissipated by the resistor?
If the voltage across a resistor is doubled while the resistance remains constant, what happens to the power dissipated by the resistor?
What is the relationship between electrical conductivity and electrical resistivity?
What is the relationship between electrical conductivity and electrical resistivity?
Which of the following factors does NOT affect the resistance of a conductor?
Which of the following factors does NOT affect the resistance of a conductor?
If a resistor has a voltage of 5V across it and a current of 2A flowing through it, what is the power dissipated by the resistor?
If a resistor has a voltage of 5V across it and a current of 2A flowing through it, what is the power dissipated by the resistor?
Flashcards
What is Ohm's Law?
What is Ohm's Law?
Ohm's Law states that in electrical conductors, the voltage is directly proportional to the current when the temperature is constant.
What are metallic conductors?
What are metallic conductors?
Metals that allow electricity to flow easily.
Electrical Resistance
Electrical Resistance
Symbol: R, Unit: Ohm (Ω), Formula: R = U/I
Gluhlampe Meaning?
Gluhlampe Meaning?
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Widerstandsgesetz Meaning?
Widerstandsgesetz Meaning?
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What is electrical power?
What is electrical power?
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Study Notes
- URI
Ohm's Law
- Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it, at a constant temperature.
- The greater the voltage, the greater the current flow at consistent resistance.
- Metallic conductors S ~ U
Light Bulbs
- The greater the voltage, the greater the current, the brighter the light.
Resistance Law
- Formula symbol for resistance is R.
- Electrical Resistance Units are: Ω = U/A and R = U / I
Resistance
- The electrical resistance equation is: R = p * (l / A)
Electrical Power
- Formula symbol is P.
- Units are AV = 1 Watt, and W = Watt
- The formula is P = U * I
- U denotes voltage and I denotes current.
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