Podcast
Questions and Answers
What describes the relationship between voltage and current according to Ohm's Law?
What describes the relationship between voltage and current according to Ohm's Law?
- They are inversely proportional.
- Voltage is independent of current.
- They are directly proportional. (correct)
- They are unrelated.
In a parallel connection of circuits, which of the following is true?
In a parallel connection of circuits, which of the following is true?
- All parts are in a single direction. (correct)
- Voltage across each component is the same. (correct)
- Each part has its own circuit path.
- All components share the same current.
How is resistance calculated for a specific circuit?
How is resistance calculated for a specific circuit?
- By finding the ratio of current to voltage.
- By adding the values of voltage and current.
- Using the formula $R = R_{on} + a$.
- Using the formula $R = R_{on} imes a$. (correct)
What is the role of resistance in an electric circuit?
What is the role of resistance in an electric circuit?
When graphing voltage (U) and current (I), which variable should be plotted on the x-axis?
When graphing voltage (U) and current (I), which variable should be plotted on the x-axis?
Flashcards
Electric Current
Electric Current
The rate at which electrical charge flows.
Voltage
Voltage
The electrical potential difference between two points, representing the energy per unit charge.
Parallel Circuit
Parallel Circuit
A circuit where components are connected across each other, with multiple paths for current to flow.
Ohm's Law
Ohm's Law
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Resistance Formula
Resistance Formula
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Study Notes
Electrical Circuits
- Charge indicates electron deficiency (positive) or excess (negative)
- Current (amps) represents number of electrons per unit time
- Voltage (volts) pushes current, hindering electron flow
- Resistance (ohms) opposes current flow
Parallel vs Series Circuits
- Parallel: Each component has its own current path. All components share the same voltage.
- Series: Components share one current path. Voltage is split proportional to resistance.
Calculations
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Parallel circuit calculation: 1/RT = 1/R1 + 1/R2 + ...
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Series circuit calculation: RT = R1 + R2 + ...
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Ohm's Law: Voltage is directly proportional to current. V = I × R.
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Resistor values can be mathematically derived from
an equation using Ohm's Law.
Graphing
- Voltage vs. Current graphs for a resistor show a straight line, indicating direct proportion.
- A graph for a light bulb (non-linear) shows a non-proportional relationship between voltage and current.
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