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32 Cards in this Set
- Front
- Back
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Energy is governed by |
Law of conservation of energy expressed by the work energy theorem |
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Energy is the capacity to do |
Work |
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Work is done in a given time expressed as |
Power |
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The work energy theorem states the relationship between |
Power and kinetic energy |
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The law of conservation of energy applies to forms of |
Mechanical energy |
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Energy exists in |
Different forms such as mechanical energy which may be classified as kinetic or potential energy |
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Kinetic energy depends on |
Mass and velocity |
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Potential energy due to position is called ____ (1) and potential energy due to deformation is called ____ (2) |
1. Gravitational Potential Energy 2. Elastic Potential Energy |
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Formula for work |
FD or PT |
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Formula for power |
W/T |
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Types of energy |
Mechanical energy - possessed by objects due to motion or position Electrical energy - movement of charges, may produce light energy by powering light bulbs Light energy - electromagnetic radiation associated with certain wavelengths Electromagnetic energy - light, x-ray, radio, TV waves, microwaves, UV rays, gamma Chemical energy - stored in chemical bonds of atoms and molecules Nuclear energy - stored in nuclei of atoms Heat energy - released bg moving particles |
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Heat energy is produced by |
Converting mechanical energy to the former by rubbing 2 objects together. Friction causes this |
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Kinetic energy formula |
KE=1/2mv^2 |
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GPE formula |
mgh OR wh |
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ME formula |
PE + KE |
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Electric current is mathematically expressed as |
I = q/t |
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Electric current may pass through |
Semiconductors which may act as either conductors or insulators |
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Electric current flows easily through ___ and cannot do so through ___ |
Conductors, insulators |
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Electric current flows through an |
Electric circuit |
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An electric circuit consists of |
Source of energy, load or resistance, wires, and switch |
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An electric circuit may be classified as either |
Series or parallel |
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Resistance of conductors such as wires depends on |
Nature of material, temp, length, diameter |
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Electric current increases if there is an increase in ___ and decreases if there is an increase in ___ |
Voltage, resistance |
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Electric current can be measured by |
An ammeter |
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Current is measured in ___ |
Amperes |
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The direction of electric flow is from a place of |
Higher potential to lower potential, the difference being the voltage measured in V(volts) |
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The direction of electric flow is from a place of |
Higher potential to lower potential, the difference being the voltage measured in V(volts) |
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How much the conductor resists flow of electric charges |
Resistance expressed in Ohms |
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Resistance of most materials increases with |
The increase of temperature |
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The resistance of a conductor is directly proportional to its |
Length |
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The resistance of a conductor is inversely proportional to its |
Diameter |
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Ohm's law is represented by the equation |
I = V/R which can be rearranged to V=IR and R=V/I |
