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Questions and Answers
A circuit contains a resistor with a significant potential difference. If the resistance is doubled while maintaining the same current, what change will be observed in the potential difference across the resistor?
A circuit contains a resistor with a significant potential difference. If the resistance is doubled while maintaining the same current, what change will be observed in the potential difference across the resistor?
- The potential difference will be doubled. (correct)
- The potential difference will remain the same.
- The potential difference will be halved.
- The potential difference will quadruple.
In a circuit with multiple resistors, how should a voltmeter be connected to measure the potential difference across one specific resistor?
In a circuit with multiple resistors, how should a voltmeter be connected to measure the potential difference across one specific resistor?
- In series with the resistor.
- In series with the entire circuit.
- In parallel with the resistor. (correct)
- There is no need to connect a voltmeter, potential difference can be derived by calculation.
A technician needs to measure the potential difference across a device. However, the technician only has an ammeter. What is the best course of action?
A technician needs to measure the potential difference across a device. However, the technician only has an ammeter. What is the best course of action?
- Connect the ammeter in series with the device and calculate the potential difference using the device's known resistance. (correct)
- Use the ammeter in place of the voltmeter.
- Connect the ammeter in series, then connect a resistor of known quantity in parallel and measure the current again. Potential difference can then be determined.
- Connect the ammeter in parallel with the device and measure the current through the device.
If a component's resistance increases while the potential difference is constant, what happens to the current flowing through it?
If a component's resistance increases while the potential difference is constant, what happens to the current flowing through it?
A parallel circuit consists of two resistors, $R_1$ and $R_2$, with $R_1 = 10 \Omega$ and $R_2 = 20 \Omega$. If the potential difference across $R_1$ is 5V, what is the potential difference across $R_2$?
A parallel circuit consists of two resistors, $R_1$ and $R_2$, with $R_1 = 10 \Omega$ and $R_2 = 20 \Omega$. If the potential difference across $R_1$ is 5V, what is the potential difference across $R_2$?
Flashcards
Potential Difference
Potential Difference
The 'push' that drives current; measured in volts (V).
Resistance
Resistance
Opposition to current flow, measured in ohms (Ω).
Voltmeter
Voltmeter
A device used to measure potential difference.
Parallel Connection
Parallel Connection
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Factors affecting current
Factors affecting current
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Study Notes
- Current flow through a component hinges on its resistance and the potential difference across it.
- To gauge potential difference, voltmeters are connected in parallel with the component.
- Potential difference, or voltage, is quantified in volts (V).
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Description
Explore the relationship between current, resistance, and potential difference in electrical components. Learn how voltmeters are used to measure potential difference, also known as voltage, in volts (V). Understand the concept of parallel connections for accurate voltage measurement.