Questions and Answers
What is the unit of charge (Q) in the context of electrical energy storage?
Coulombs
In a capacitor, what is the insulating layer separating the conducting plates called?
Dielectric
According to Ohm's Law, what is the relationship between current (I), voltage (V), and resistance (R) in a conductor?
V = IR
What effect does increasing the separation distance of separated charge (Q) have on voltage (V)?
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What is the ability of a capacitor to store charge measured in?
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According to the relationship C ∝ A/D, if the distance (D) between plates remains constant, what happens to the capacitance (C) when the plate area (A) increases?
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What effect does increasing the density of charge (Q) on the plates have on the voltage (V) across the capacitor?
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In the context of neuronal membranes, what creates a voltage across the membrane similar to an electronic capacitor?
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What is the relationship between charge (Q), voltage (V), and capacitance (C) expressed by the equation Q=CV?
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What is the purpose of selectively permeable ion channels in creating the resting membrane potential in neurons?
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Study Notes
Electrical Energy Storage
- The unit of charge (Q) is a fundamental concept in electrical energy storage.
Capacitor Structure
- The insulating layer separating the conducting plates in a capacitor is called the dielectric.
Ohm's Law
- The relationship between current (I), voltage (V), and resistance (R) in a conductor is I = V/R.
Capacitor Properties
- Increasing the separation distance of separated charge (Q) decreases the voltage (V).
- The ability of a capacitor to store charge is measured in capacitance (C).
- Capacitance (C) is directly proportional to the plate area (A) when the distance (D) between plates remains constant, as expressed by the equation C ∝ A/D.
- Increasing the plate area (A) while keeping the distance (D) constant increases the capacitance (C).
- Increasing the density of charge (Q) on the plates increases the voltage (V) across the capacitor.
Neuronal Membranes
- The separation of charge across the neuronal membrane creates a voltage similar to an electronic capacitor.
- Selectively permeable ion channels help create the resting membrane potential in neurons by regulating the flow of ions across the membrane.
Capacitance Equation
- The relationship between charge (Q), voltage (V), and capacitance (C) is expressed by the equation Q = CV.
