Questions and Answers
What is the symbol for electrical charge?
Q
What is the unit of measurement of charge and its symbol?
Coulomb, C
What is the number of electrons for one unit of charge?
6.28 * 10^18 electrons
Describe static electricity.
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Define electrical current.
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What is the symbol for electric current?
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Write an equation to state the relationship between current, charge and time.
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What is the unit of measurement for electric current and its symbol?
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Describe conventional current flow.
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Define voltage.
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What is the name of the force that maintains a voltage?
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State the abbreviation for this force.
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State the unit of measurement for voltage and its symbol.
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State the symbols used to represent source voltage.
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State the symbols used to represent voltage drop.
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List six methods of producing an electromotive force.
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Define resistance.
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State the unit of measurement for resistance and its symbol.
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State Ohm's law in the form of an equation.
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How is Ohm's law stated?
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Define one volt in terms of Ohm's law.
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Define electric circuit.
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Define voltage rise.
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Define voltage drop.
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Study Notes
Electrical Charge and Current
- The symbol for electrical charge is Q.
- Charge is measured in coulombs (C).
- One unit of charge corresponds to approximately 6.28 x 10^18 electrons.
Static Electricity and Current
- Static electricity refers to the accumulation of charge on an insulated object.
- Electric current is defined as the flow of electrons from a negatively charged point to a positively charged point.
- The symbol for electric current is I.
- The relationship between current (I), charge (Q), and time (t) is expressed as I = Q/t.
Voltage and Electromotive Force
- Voltage indicates an imbalance of electron charges between two points.
- The force maintaining voltage is called electromotive force (emf), abbreviated as emf.
- Voltage is measured in volts (V).
Voltage Representation
- Source voltage is represented by the symbol E.
- Voltage drop is denoted by V with a subscript.
Methods of Producing EMF
- Electromotive force can be produced through several means:
- Magnetic: e.g., generator
- Chemical: e.g., battery
- Friction: e.g., Van de Graaf generator
- Heat: e.g., thermocouple
- Light: e.g., solar cells
- Pressure: e.g., piezo crystal
Resistance and Ohm's Law
- Resistance is a property of materials that opposes electric current flow.
- Resistance is measured in ohms (Ω).
- Ohm’s Law is expressed as I = E/R, indicating that current (I) is directly proportional to emf (E) and inversely proportional to resistance (R).
Understanding Voltage
- One volt is the potential difference required to cause a current of one ampere to flow through a resistance of one ohm.
- An electric circuit is formed when a source of emf is connected to the ends of a conductor.
- Voltage rise refers to the source or applied voltage (emf).
- Voltage drop is the difference in charge observed across the load.
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Test your knowledge of electrical principles with these flashcards focused on current, voltage, and resistance. Each card presents a key concept or term related to electricity, aiding in your understanding of fundamental concepts in physics. Perfect for students looking to solidify their grasp of electrical charge and its units.