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Questions and Answers
In a circuit with a constant voltage, how does increasing the resistance affect the current?
In a circuit with a constant voltage, how does increasing the resistance affect the current?
- Current remains constant.
- Current increases exponentially.
- Current decreases linearly. (correct)
- Current increases linearly.
The resistance of a wire is solely determined by the material it's made of and is unaffected by its length or cross-sectional area.
The resistance of a wire is solely determined by the material it's made of and is unaffected by its length or cross-sectional area.
False (B)
A parallel circuit has two resistors, $R_1$ and $R_2$, with a voltage $V$ applied across them. If $R_1 = 2R_2$, what is the ratio of the current through $R_1$ to the current through $R_2$?
A parallel circuit has two resistors, $R_1$ and $R_2$, with a voltage $V$ applied across them. If $R_1 = 2R_2$, what is the ratio of the current through $R_1$ to the current through $R_2$?
1/2
In a series circuit, the total resistance is the ________ of individual resistances, while in a parallel circuit, the reciprocal of the total resistance is the sum of the ________ of individual resistances.
In a series circuit, the total resistance is the ________ of individual resistances, while in a parallel circuit, the reciprocal of the total resistance is the sum of the ________ of individual resistances.
Match each scenario with the correct application of Ohm's Law:
Match each scenario with the correct application of Ohm's Law:
A circuit contains two resistors in series: a 100-ohm resistor and an unknown resistor. If the voltage drop across the 100-ohm resistor is 5V and the total voltage supplied to the circuit is 15V, what is the value of the unknown resistor?
A circuit contains two resistors in series: a 100-ohm resistor and an unknown resistor. If the voltage drop across the 100-ohm resistor is 5V and the total voltage supplied to the circuit is 15V, what is the value of the unknown resistor?
If the voltage in a circuit is doubled and the resistance is halved, the current remains the same.
If the voltage in a circuit is doubled and the resistance is halved, the current remains the same.
A circuit has a voltage source of $V$ volts and a resistor of $R$ ohms. If a second identical resistor is added in parallel, by what factor does the total current from the source increase?
A circuit has a voltage source of $V$ volts and a resistor of $R$ ohms. If a second identical resistor is added in parallel, by what factor does the total current from the source increase?
Ohm's Law is applicable only for ________ conductors, where the resistance remains constant regardless of the voltage applied.
Ohm's Law is applicable only for ________ conductors, where the resistance remains constant regardless of the voltage applied.
A resistor has a color code of Brown, Black, Red, and Gold. According to the color code, what is its resistance value and tolerance?
A resistor has a color code of Brown, Black, Red, and Gold. According to the color code, what is its resistance value and tolerance?
Flashcards
What is Ohm's Law?
What is Ohm's Law?
The relationship between voltage, current, and resistance in a circuit.
Unit of Voltage
Unit of Voltage
Voltage is measured in volts (V).
Unit of Resistance
Unit of Resistance
Resistance is measured in ohms (Ω).
Unit of Current
Unit of Current
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How to Calculate Voltage
How to Calculate Voltage
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How to Calculate Current
How to Calculate Current
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How to Calculate Resistance
How to Calculate Resistance
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Example: 12V and 250Ω, find current
Example: 12V and 250Ω, find current
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Study Notes
Ohm's Law Overview
- Ohm's Law defines the relationship between current, voltage, and resistance in electrical circuits
- Knowing two of these values allows calculating the third
Electrical Units and Symbols
- Voltage is represented by V and measured in volts
- Resistance is represented by R (or the omega symbol: Ω) and measured in ohms
- Current is represented by I and measured in amps
Ohm's Law Triangle
- The Ohm's Law triangle visually represents the relationships: voltage, current, and resistance
- To find voltage (V): V = I x R (Current multiplied by Resistance)
- To find current (I): I = V / R (Voltage divided by Resistance)
- To find resistance (R): R = V / I (Voltage divided by Current)
Example Calculation
- A circuit has a 12-volt battery connected to a 250-ohm resistor
- To calculate current (I): I = 12V / 250Ω = 0.048 amps, or 48 milliamps
- Wire resistance is ignored, but it contributes to overall resistance
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