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Questions and Answers
In a series circuit with three resistors, $R_1 = 10Ω$, $R_2 = 20Ω$, and $R_3 = 30Ω$, what is the total resistance of the circuit?
In a series circuit with three resistors, $R_1 = 10Ω$, $R_2 = 20Ω$, and $R_3 = 30Ω$, what is the total resistance of the circuit?
- 6Ω
- 60Ω (correct)
- 30Ω
- 0.06Ω
If a parallel circuit has two resistors, one with a resistance of $4Ω$ and the other with a resistance of $8Ω$, what is the total resistance of the circuit?
If a parallel circuit has two resistors, one with a resistance of $4Ω$ and the other with a resistance of $8Ω$, what is the total resistance of the circuit?
- 12Ω
- 32Ω
- 2.67Ω (correct)
- 0.375Ω
A circuit contains a $6V$ battery and a resistor with a resistance of $2Ω$. According to Ohm's Law, what is the current flowing through the circuit?
A circuit contains a $6V$ battery and a resistor with a resistance of $2Ω$. According to Ohm's Law, what is the current flowing through the circuit?
- 3A (correct)
- 12A
- 0.33A
- 4A
Which of the following circuit arrangements ensures that each component receives the same voltage?
Which of the following circuit arrangements ensures that each component receives the same voltage?
Why is it important to use correct circuit symbols when drawing circuit diagrams?
Why is it important to use correct circuit symbols when drawing circuit diagrams?
A light bulb in a circuit has a resistance of $10Ω$ and draws a current of $0.5A$. What is the voltage across the light bulb?
A light bulb in a circuit has a resistance of $10Ω$ and draws a current of $0.5A$. What is the voltage across the light bulb?
Which of the following is the correct symbol for a resistor in a circuit diagram?
Which of the following is the correct symbol for a resistor in a circuit diagram?
What happens to the total current in a series circuit if the resistance is increased?
What happens to the total current in a series circuit if the resistance is increased?
In a parallel circuit powered by a $9V$ battery, what is the voltage across each of the resistors?
In a parallel circuit powered by a $9V$ battery, what is the voltage across each of the resistors?
What is the primary function of a switch in an electrical circuit?
What is the primary function of a switch in an electrical circuit?
Flashcards
What is electricity?
What is electricity?
The flow of electric charge, typically carried by electrons.
What is Charge (Q)?
What is Charge (Q)?
The quantity of electricity, measured in coulombs (C).
What is Current (I)?
What is Current (I)?
The rate at which charge flows, measured in amperes (A).
What is Voltage (V)?
What is Voltage (V)?
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What is Resistance (R)?
What is Resistance (R)?
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What is an electric circuit?
What is an electric circuit?
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What is a Series Circuit?
What is a Series Circuit?
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What is a Parallel Circuit?
What is a Parallel Circuit?
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What is Ohm’s Law?
What is Ohm’s Law?
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What is the function of a battery?
What is the function of a battery?
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Study Notes
- Electricity is the flow of electric charge, typically carried by electrons and is the force behind most modern technology
Types of Electricity
- Static electricity involves charge building up on an object
- Current electricity involves a steady flow of charge through a circuit in order to power devices
Key Terms
- Charge (Q) is the quantity of electricity, measured in coulombs (C)
- Current (I) is the rate at which charge flows, measured in amperes (A)
- Voltage (V) is the electrical force that pushes charge along, measured in volts (V)
- Resistance (R) is the measure of how much a material opposes the flow of current, measured in ohms (Ω)
Electric Circuits
- An electric circuit is a closed path through which current flows
- A basic circuit includes a power source, wires, and devices
Circuit Types
- Series circuits connect components one after the other, forming a single path
- The same current flows through each component in a series circuit
- The total resistance in a series circuit is the sum of the individual resistances, expressed as Rtotal = R1 + R2 + R3 + ...
- Parallel circuits connect components along multiple paths
- Each component in a parallel circuit has the same voltage across it
- The total resistance in a parallel circuit is found using the reciprocal formula: 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ...
Ohm's Law
- Ohm’s Law is a principle that connects voltage, current, and resistance in a circuit and is expressed as V = I × R, where:
- V = Voltage (volts)
- I = Current (amperes)
- R = Resistance (ohms)
- In a circuit with a 12V battery connected to a 4Ω resistor, the current flowing is calculated as I = V/R = 12V/4Ω = 3A
Common Circuit Symbols
- Battery is represented as ⎓ (or a pair of lines with one longer) and provides energy
- Resistor is represented as ⏚ or a zigzag line and limits current flow
- Light Bulb is represented as 💡 (or a circle with a filament) and produces light
- Switch is represented as —o— (open or closed can be depicted) and opens or closes the circuit
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