Questions and Answers
Any circuit in which the same current flows through all components is a(n) ?_ circuit.
series
Any circuit in which the current is split or follows two (or more) alternative paths is called a(n) ? circuit.
parallel
A circuit in which some of the components are series connected, while other components are parallel connected, is called a(n) ?_ or ? circuit.
combination, series-parallel
When it is difficult to recognize which parts of a circuit are series connected and which are parallel connected in a combination circuit, it is often necessary to ?_ the circuit.
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For combination circuits, trace the current paths through the circuit to determine which resistors are connected in series and which are connected in parallel.
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The first step is to reduce the combination circuit to a simpler circuit one part at a time.
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Three resistors in parallel can be reduced to a single equivalent resistor.
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In a combination circuit, the amount of current that passes through each resistor is exactly the same.
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No matter how complex a combination circuit is, it can be reduced to a single voltage, current, and resistance.
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When simplifying resistance in series and parallel, a(n) ? resistance is substituted back into the circuit that represents the total value as all of the resistances that were combined.
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In reducing series-parallel circuits to the simplest form, the equivalent circuit is usually represented by _? that is connected in ? with the voltage source.
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What are the basic steps in reducing a combination circuit to its simplest form?
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When determining if components in a circuit are in series or parallel with each other, you should ? the current ? path(s).
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In a combination circuit, the current leaving the source is (______/different than) the current returning to the source.
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In parallel circuits, when the voltage applied to the branch and the branch resistance is known, can easily calculate the ?_ for that branch.
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In series circuits, when the current through the circuit and the resistance of each component is known, you can easily calculate the ? for each component in that circuit using Ohm's law.
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Branch-circuit currents are generally calculated by applying ?_ to the voltage across the branch and the branch resistance.
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In combination circuits, after solving for the total current through the circuit, the values for the ? through the individual resistors may be calculated by working backwards from the total equivalent ?_ using Ohm's law.
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The total Voltage dropped across a series-parallel circuit equals ?.
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In a parallel portion of a series-parallel circuit, the voltage across a parallel branch can be found by taking the total branch current times the ? of the parallel branch.
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What is the first step necessary to allow calculation of voltages in a combination circuit containing resistive loads in series and parallel?
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In a series circuit or parallel circuit, the total power consumed by the circuit is equal to Et times ?, or the ? of the power consumed by each resistor.
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Give three reasons why three-wire, single-phase systems are used.
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Study Notes
Circuit Types
- A series circuit has the same current flowing through all components.
- A parallel circuit has current split among two or more alternative paths.
- A combination circuit (or series-parallel circuit) has components both in series and parallel configurations.
Understanding Combination Circuits
- Redrawing the circuit may be necessary when it's unclear which components are in series or parallel.
- To simplify, trace the current paths to identify resistor connections.
- Reducing a combination circuit typically involves simplifying one part at a time.
Simplification Process
- Equivalent resistance is used to replace combined resistors within a circuit.
- The simplified combination circuit is represented as one equivalent resistance in series with the voltage source.
- Steps to reduce a combination circuit:
- Reduce one section at a time.
- Redraw the circuit by replacing original resistors with their equivalent.
- Combine series resistors before addressing parallel parts.
- Repeat until achieving a single equivalent resistance.
Current and Voltage Relationships
- The current leaving the voltage source is equal to the current returning.
- In parallel circuits, knowing the voltage and resistance allows calculation of branch current.
- In series circuits, the voltage drop across each component can be determined using Ohm's law based on known current and resistance.
Calculating Power and Resistance
- Total power consumed in the circuit equals the sum of power consumed by each resistor.
- Voltage dropped in a series-parallel circuit equals the supply voltage.
- After determining total current, individual current values through resistors can be calculated using Ohm's law where total resistance is known.
Practical Applications
- Three-wire, single-phase systems are favored for:
- Reduced installation costs.
- Lower line loss.
- Decreased voltage drop.
- These systems provide a 240-volt connection for balanced loads.
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Description
Test your knowledge of combination circuits with these flashcards. Each card contains important terms and definitions related to electrical circuits. Dive into the concepts of series and parallel circuits, and understand their connections.
