Questions and Answers
The expression that relates emf, potential, current, and resistance is Ohm's law.
True
Electrons in a series circuit all follow the same path.
True
An ammeter is a device that measures potential.
False
The watt is a unit of potential energy.
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Current is constant at all points in a parallel circuit.
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Current is directly proportional to resistance.
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As parallel resistors are added, circuit resistance decreases.
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Resistance of a conductor is directly proportional to length.
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Silver has very low resistivity.
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Match the following items:
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Calculate the total resistance in the series circuit.
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Calculate the current through R1 in the series circuit.
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Calculate the current through R2 in the series circuit.
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Calculate the potential drop across R1 in the series circuit.
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Calculate the potential drop across R2 in the series circuit.
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Calculate the total power developed in the circuit.
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Calculate the total resistance in the parallel circuit.
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Calculate the total current in the parallel circuit.
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Calculate the current through R1 in the parallel circuit.
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Calculate the current through R2 in the parallel circuit.
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Calculate the potential drop across R1 in the parallel circuit.
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Calculate the power developed in R1.
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Study Notes
Electric Currents Fundamentals
- Ohm's Law relates electromotive force (emf), potential, current, and resistance.
- In a series circuit, all electrons follow the same path.
- An ammeter is used to measure current, not potential.
- The watt is a unit of power, not potential energy.
- Current is not constant in parallel circuits; it varies among branches.
- Current and resistance are inversely related; as resistance increases, current decreases.
- Adding parallel resistors reduces total circuit resistance.
Resistance Characteristics
- Resistance of a conductor is directly proportional to its length.
- Silver is noted for its very low resistivity, making it an excellent conductor.
Unit Matching
- Amperes correspond to current.
- Volts are associated with voltage.
- Watts define power.
- EMF refers to electromotive force.
- Ohm-cm represents resistivity.
Series Circuit Calculations
- Total resistance in a specific series circuit equals 15 ohms.
- Current through resistor R1 is calculated as 1.0 amp.
- Current through resistor R2 is also 1.0 amp.
- Potential drop across R1 measured at 10 volts.
- Potential drop across R2 calculated at 5 volts.
- Total power developed in the circuit is 15 watts.
Parallel Circuit Calculations
- Total resistance of the particular parallel circuit is 2.3 ohms.
- Total current measured in the parallel circuit is 10 amps.
- Current through resistor R1 equals 8.0 amps.
- Current through resistor R2 measured at 2.7 amps.
- Potential drop across R1 calculated at 24 volts.
- Power developed in resistor R1 equals 190 watts.
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Description
Test your knowledge on electric currents with this quiz. You'll find questions covering fundamental concepts like Ohm's Law, circuit paths, and measurement devices. Perfect for students looking to reinforce their understanding of electrical principles.
