Questions and Answers
What is the flow of electrons in a closed circuit called?
Electrical current
The three electrical quantities in basic electrical circuits are Voltage, Current, and __________.
Resistance
Electrons flow from the positive terminal to the negative terminal of a power supply.
False
Which of the following best defines Direct Current (DC)?
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Match the electrical quantities to their units of measure:
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What is the formula to find Voltage using Current and Resistance?
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What unit is Resistance measured in?
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What does a higher value of conductance imply?
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Resistance can have a negative value.
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Study Notes
Potential Difference and Electrical Current
- Protons, neutrons, and electrons together form stable atoms; separating them creates a potential difference (attraction).
- A closed circuit allows loose electrons to move back to protons, generating an electrical current.
- Resistance restricts electron flow through a circuit, impacting current flow.
- Three foundational electrical quantities: Voltage (V), Current (I), and Resistance (Ω).
Current Fundamentals
- Direct Current (DC) flows steadily in one direction, while Alternating Current (AC) alternates directions.
- Current, measured in Amperes (A), quantifies charge movement per second; affected by circuit voltage and resistance.
- Conventional current assumes flow from positive to negative terminal, though actual electron flow is the opposite.
Voltage Concepts
- Voltage (V) represents potential energy stored as electrical charge, pushing electrons through conductors.
- DC Voltage remains constant, while AC Voltage varies periodically in amplitude.
- One Volt (V) is defined as the pressure to drive one Ampere through one Ohm of resistance.
Resistance Characteristics
- Resistance (R) is a material's opposition to current flow, quantified in Ohms (Ω).
- A resistor is a circuit component specifically designed to provide resistance.
- Resistance values cannot be negative; only positive values exist.
Ohm's Law
- Ohm's Law establishes the relationship between Voltage, Current, and Resistance:
- V = I x R (to find Voltage)
- I = V ÷ R (to find Current)
- R = V ÷ I (to find Resistance).
Electrical Power Concepts
- The text introduces foundational concepts critical for understanding electrical circuits and their functioning.
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Description
This quiz covers the fundamental concepts of electrical engineering, focusing on potential difference and atomic stability. It is designed for students in the Basic Electrical and Electronics course at Amrita School of Engineering. Test your understanding of electrical principles and their applications.
