Download
1 / 30
310 likes | 446 Vues
Physics, Electricity and Magnetism Vocabulary. Where do Polar Bears live?. The North Pole. What is polarity?. Electrical polarity (positive and negative) is present in every electrical circuit .
E N D
Where do Polar Bears live? The North Pole
What is polarity? Electrical polarity (positive and negative) is present in every electrical circuit. A magnet has a polarity, in that one end is the "north" and the other is the "south". Opposite poles attract but similar poles repell each other. You cannot make the north poles of two magnets stick together.
What is a magnet? a piece of iron (or an ore, alloy, or other material) that has its component atoms(electrons) so ordered that the material exhibits properties of magnetism
What is magnetism? a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
What happens when I hit the cue ball into the line of pool balls? The end ball moves the others move a little.
What is electric current? currentis what happens when the random exchange of electrons that occurs constantly in a conductor becomes organized and begins to move in the same direction. even though the individual electrons move slowly, the current itself moves at nearly the speed of light. Thus, when you flip a light switch, the light turns on immediately, no matter how much distance separates the light switch from the light.
How is electricity measured? We know that electricity can be measured in volts. Household electricity is 120 volts (abbreviated 120 V). Flashlight batteries are 1.5 volts. Car batteries are 12 volts. We also know that electricity can be measured in watts. Incandescent light bulbs are typically 60, 75, or 100 watts. Compact fluorescent lights (CFLs) have somewhat smaller wattage ratings. Microwave ovens and hair dryers are 1,000 or 1,200 watts. We also may know that there's a third way to measure electricity, called amps. A typical household electrical outlet is 15 amps (abbreviated 15 A).
What is Kilowatt Hours unit of energy equal to 1,000 watt-hours. The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities.
How do you calculate? Watts = Amps x Volts Watts is also known as volt-amps and is typically used in conjunction with AC power circuits. Fill in any of the two fields to find the value of the third. Example 1 You have a 12 Volt power supply that delivers 1 Amp of current. Fill in the Volts and Amps fields to find the Watts. Example 2 The AC24-40 power supply is a 24V AC power supply that can power up to 40 VA. Enter 24 under volts Enter 40 under watts Click calculate You get 1.66 in this example. Thus, the AC24-40 can supply up to 1.6 Amps at 24V AC.
What is Conventional Current? In solid metals such as wires, the positive charge carriers are immobile, and only the negatively charged electrons flow. Because the electron carries negative charge, the electron motion in a metal is in the direction opposite to that of conventional (or electric) current. from the positive terminal of a cell to its negative terminal. It is opposite in direction to the flow of electrons.
What is Electrical Potential energy? Potential energy is a form of stored energy Electric Potential Energy is experienced by charges both different and alike, as they repel or attract each other.
What is Ohm’s law This law defines the relationships between current, voltage and resistance. A good way to understand ohms laws is an analogy with a domestic water system. The same way that an electric current flows through a copper wire, water flows through a copper pipe in a water system. Most people do not think to much about the fact but when they turn on tap the water comes out as a result of the pressure that is provided by a pumping station some miles away. This water pressure is similar to that used to drive electricity around a circuit, the potential difference or pd for short is the term that is used - this is measured in volts. This driving force is provided by a battery or in the case of mains electricity a generator at the power station
What is a Equivalent Resistance how to connect individual resistors together to form either a Series Resistor Network or a Parallel Resistor Network and we used Ohms Law to find the currents and voltages flowing in each resistor combination and add them.
What is an Electric Field? Electric field is defined as the electric force per unit charge. The direction of the field is taken to be the direction of the force it would exert on a positive test charge. The electric field is radially outward from a positive charge and radially in toward a negative point charge.
What is a schmatic. a representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. .
Coulomb’s law Coulomb's law describes the relationship between force, charge and distance. The law looks at the forces created between two charged objects. As distance increases, the forces and electric fields decrease.
What is Ohm’s law V=I(R) V is Volts I is Electric Current R is resistance(light bulb)
Plasma is? Plasma is a form (also called state) of matter. The three other common states of matter are solids, liquids and gases, so plasma is sometimes called the fourth state of matter. Plasma is created by adding energy to a gas so its atoms and molecules separate (called ionization) into negatively charged electrons, and positively charged ions. Unlike the other states of matter, the charged particles in a plasma will react strongly to electric and magnetic fields (i.e. electromagnetic fields). If a plasma loses heat, the ions will re-form into a gas. Neon or Flourescent lights.
Superposition Superposition and interference When two electromagnetic waves of the same frequency superpose in space, the resultant electric and magnetic field strength of any point of space and time is the sum of the respective fields of the two waves. When one forms the sum, both the magnitude and the direction of the fields need be considered, which means that they sum like vectors. In the special case when two equally strong waves have their fields in the same direction in space and time (i.e., when they are in phase), the resultant field is twice that of each individual wave. The resultant intensity, being proportional to the square of the field strength, is therefore not two but four times the intensity of each of the two superposing waves. Constructive or Destructive Interference.
Electric Generator device that converts mechanical energy to electrical energy. (the opposite of an electric motor) In the case of a home generator you are converting gasoline or natural gas into electricity
Turbine Type of generator: turbinesteam engine, water falling through a turbine or waterwheel, a wind turbine,[
Induction is is the production of a potential difference (voltage) across a conductor when it is exposed to a varying magnetic field. It is described mathematically by Faraday's law of induction, named after Michael Faraday who is generally credited with the discovery of induction in 1831.
What is a Conductor and Insulator conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them(plastic, glass, wood, paper)
