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Numeracy, Chemistry and Physics > Electrical properties > Flashcards

Electrical properties Flashcards

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1
Q

What is the unit of charge?

A

Coulomb (C)

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2
Q

What does the Faraday constant represent?

A

The charge on 1 mole of electrons.

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3
Q

What is the value of the Faraday constant?

A

9.648x10^4

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4
Q

What is an electrical field?

A

A region where an electric force is experienced and can be mapped by electrostatic lines of force.

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5
Q

What is the force on a charged body within an electric field dependent on?

A
  • The charge on the body

- The strength or intensity of the field

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6
Q

What is the unit of potential?

A

Volt

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7
Q

What is a volt?

A

The potential difference between two points A and B is one volt if the work done in taking once coulomb of positive charge from B to A is one Joule.

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8
Q

What is potential difference?

A

The difference in electrical potential between two points.

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9
Q

What can be used to measure membrane potential?

A

A microelectrode and a reference electrode connected to a potentiometer.

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10
Q

What are conductors?

A

Anything that can transmit charge.

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11
Q

What are the conductors of biology?

A

Electrolyte solutions.

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12
Q

What allows for conduction in metals?

A

Free electrons

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13
Q

What does an electrical field do to free electrons?

A

Accelerates them so they drift in the direction of the field.

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14
Q

What is the equation for calculating force?

A

F=1/r^2 (r=distance)

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15
Q

What is the symbol for charge in an equation?

A

Q

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16
Q

How do ion channels select between cations and anions?

A

Proteins comprised of negative amino acid side chains allow positive ions to pass through and vice versa.

17
Q

How does an increase in the number of charges affect potential?

A

Increases potential

18
Q

In what direction is a current carried?

A

From negative to positive

19
Q

What is a current?

A

The rate at which charge passes a point in a closed circuit.

20
Q

What is the unit of measurement for current?

A

Amperes (A)

21
Q

What is the symbol for current in an equation?

A

I

22
Q

What is resistance?

A

Opposition to flow through a conductor.

23
Q

What is the unit of measurement for resistance?

A

Ohms

24
Q

What is the symbol for resistance in equations?

A

R

25
Q

What is an electrical insulator?

A

A material that fully prevents current flow.

26
Q

What is conductance?

A

The ease with which a charge flows through a conductor.

27
Q

What is the unit of measurement for conductance?

A

Siemens

28
Q

What is the symbol for conductance in equations?

A

G or g

29
Q

What does Ohm’s law quantify?

A

The relationship between potential difference (V), current (I) and resistance (R).

30
Q

What is the equation for Ohm’s law?

A

V=IR

31
Q

What are capacitors?

A

Electrical devices that store charge.

32
Q

What is the simplest capacitor?

A

A parallel plate capacitor where the two plates are separated by a dielectric.

33
Q

How do capacitors work when connected to a battery?

A
  • electrons flow form the negative terminal to plate A and at an equal rate from plate B to the positive terminal.
  • equal positive and negative charges build up on plates and start to oppose electron flow on plate A by repulsion and reduce flow from plate B by attraction.
  • charge accumulation on plates generates potential difference which increases to a value equal to that of the battery voltage
  • when potential difference across the capacitor (V) is equal to the battery voltage (Vo) electron flow ceases and the charging current equals 0.
34
Q

What is capacitance (C)?

A

The amount of charge a capacitor can store.

35
Q

What is the unit of measurement for capacitance?

A

Farads (F).

36
Q

What is capacitance proportional to?

A
  • Surface area of the plates - increases with area.
  • Distance between plates - decreases with increased distance (d)
  • Properties of dielectric that separates the plates

Numeracy, Chemistry and Physics (5 decks)

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