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Week 2 radsci 200(1)
Carroll Chapter 7 pages 113-122
| Question | Answer |
|---|---|
| Electrodynamics | Pertaining to moving electrical charges |
| Conductor | Material that allows the efficient transfer of heat or electricity |
| Volt | Unit of electrical energy or pressure required to move one ampere of current through one ohm of resistance (About 10 feet of typical wire) |
| Dielectrics | Material that acts as an electrical insulator |
| Semiconductors | Material that can act as an electrical conductor or resistor according to the variable conditions such as temperature, the presence of light, or pre-existing charge |
| Current | Intensity of the flow of electrons |
| Ampere(Amp) | Unit for the rate of electrical current equal to one Coulomb of charge per second |
| Coulomb | Unit for electrical charge equal to 6.3 x 10^18 of free electrons |
| Circuit | A continuous circle of electrical conductors leading from a source of electromotive force (EMF) such as a battery or generator, through different resistive devices and back to the source |
| Three types of changes to increase resistance within a wire | Longer length, narrower diameter, poor conducting material/construction |
| Two types of circuit layouts | Series and parallel |
| What does mAs stand for? | Milliamperage per second |
| Three characteristics of flowing circuits | Current, resistance, electromotive force (or potential difference) |
| Ohm | Unit of electrical resistance, typical of about 10 feet (3 meters) of ordinary wire. |
| What is the formula for ohm’s law? | voltage(V) = Amps(I) x Ohms(R) |
| What is the formula for the power law? | Power(P) = Energy(E)/Time(t) |
| Watt | Unit of electrical power equal to voltage multiplied by amperage |
| What is the power, voltage, and amperage formula? | Power(P) = Amperage(I) x Voltage(V) |
| What are the two ways in which electricity can move in a wire or cable? | Direct current(DC), and Alternating current(AC) |
| Direct current | Flow of electricity continuously in one direction through a conductor |
| Alternating current | Oscillation of electricity in which electrons flow alternately in reversed directions |
| What type of current is used in an x-ray | Both Alternating current (AC) and Direct current (DC) |
| Faraday’s Law | a changing magnetic field inside a closed loop of wire induces an electromotive force (voltage), creating an electric current. |
| Electric potential (EP) | The difference in potential energy per unit charge between two locations in an electric field |
| Rectifier | an electrical device that converts alternating current (AC), which periodically switches directions, into direct current (DC), which flows in only one direction |
| What is the standard SI unit of electrical charge ? | Coulomb |
| What is the standard SI unit of electric potential difference (electromotive force)? | Volt |
| What unit is used to quantify electric current flow (rate of charge per second) in a circuit? | Ampere (Amp) |
| What type of material has few free electrons, causing high resistance so that electricity does not flow easily or at all through it? | electrical insulator |
| What specific conditions or potential differences must be present for electrons to move continuously? | a complete closed circuit must exist alongside a continuous source of electrical potential difference |
| List the essential components required for a functional, closed circuit. | power source to supply energy, conductors to carry the current, load to use the electricity, a control device like a switch to stop or start the current of electricity |
| Under what exact condition will a charged particle create a magnetic field around itself? | Motion |
| Which type of electricity (AC or DC) flows through the primary side of the x-ray machine circuit? | Alternating current (AC) |
| which type of electricity (AC or DC) is required across the x-ray tube itself? | Direct Current (DC) |
Created by:
cornie4953