Electricity & Magnetsim Flashcards by Esther Keller

Formula for calculating the total resistance in a parallel circuit

1/R(T) = 1/R(1) + 1/R(2) +….

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What is the unit for charge?

Coulombs (C)
- (shown as q in eq)

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Voltage in a series circuit __

Adds up to the supply voltage

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What is Ohm’s law?

The relationship between current, voltage and resistance in a circuit.

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Equation for the force on a charged particle moving in a magnetic field

F=Bqv
B(magnetic field), q(charge), v(velocity)

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What is the unit for voltage?

Volts (V)

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Current in a series circuit is ___

The same everywhere

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How can we find the direction force in an electromagnetic field

Using the right hand grip rule
- current is direction of thumb
- magnetic field in the direction of the fingers
when given N and S (north and south) plates, field moves from north to south

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Equation for the induced voltage on a straight conductor:

V=BvL
(velocity=magnetic field x velocity x length)

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What is the unit for current?

Amperes (A)

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F=BIL is the equation to find what?

The force of the electromagnetic field.
Uses B (magnetic field), I (current), L (length)

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Do field lines run from negative to positive or positive to negative?

Field lines ALWAYS run from positive to negative.

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Equation to find electric field strength using Voltage and distance:

E=V/D

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What is the unit for Force?

Newtons (N)

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Voltage, Energy potential and charge equation

V=∆E/q

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What is power?

The moving charges in a circuit do work, often involving heat and/or light. The rate at which electrical energy is converted into another form of energy is called power. (Given by P=∆E/t)

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Name of an electric field where the electric field lines are parallel and evenly spaced, (eg. parallel metal plates)

Uniform electric field

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What is an electric field?

A region where a charged object experiences a force. AN electric field can exist in a vacuum or in a substance. Electric fields are drawn using arrows representing the direction of the field.

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What is the unit for power?

Watts (W)

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Voltage in a parallel circuit ___

Same across all components

What two things does electric field strength depend on?

Size of the voltage
Separation (eg. distance between two metal plates)

Current in a parallel circuit __

Adds up to the supply current

What is the unit for electric potential energy?

Joules (J)

voltage over lamp(s) when lamp added

increased circuit resistance; increases current, so there is a voltage drop (less voltage)

no voltage in electric field

when current/wires are parallel to the field, there is no induced voltage,

max voltage in electric field

when current/wires are perpendicular to electric field lines

floating drop forces

electrostatic attraction (must be opposite to charge on drop) gravity/weight force forces are balanced

how does electrostatic force on object change in electric field?

electric field is constant (strength and direction) as F = eq, the charge is constant and so the force is constant

effect of doubling velocity on stopping distance

4 x kinetic energy Ek = 1/2mv2 E, q, m constant, d=Ek/Ep

force remains constant

electric field is UNIFORM, equal forces are applied :)

object moving from positive -> negative plate

electrical potential energy transferrs to kinetic energy

charge of electron moving through wire

force remains constant as electric field strength is constant, so size of charge is the same.

adding battery and shortening circuit

electric field strength depends on potential difference, as more (batteries in series) wire less, electric field strength is larger, force experienced depends on this and size of charge. as it is unchanged, force is bigger/larger

electric current

amount of charge flowing through a point in 1 second

increasing resistance

current of circuit decreases

adding lamp (parallel)

power determines brightness, less resistance = more current; more power. bulbs will be brighter

increasing resistance (adding bulb series)

decreases current & voltage, dimmer bulbs

bulb likely to blow

bulb receiving more voltage and become brighter

lamp in parallel blows

resistance of circuit increases as there are less conducting pathways, current of circuit decreases

opposite currents

induced forces cancel

moving with magnetic field

experiences no force as force on electrons is only produced when an electron moves against magnetic field

wire cutting through magnetic field

voltage equal to induced voltage, no current will flow

voltage induced

electrons moving through magnetic field at right angles, force at right angles on electrons that causes charge separation

magnetic field force

only charged particles moving through a magnetic field experience a force <3

object on object voltage (in magnetic field)

cuts through magnetic field, both have opposite voltage, so there is no current

positive charge (magnetic field into page) direction

anticlockwise

negative charge (magnetic field into page) direction

clockwise

object moving through down magnetic field

electrons cut magnetic field so there is a charge seperation