Flashcards

Chapter 14: Electrical Safety

Dakota Templeton Safety ASP English 26 cards

Cards in this deck (26)

1VoltageTotal amount of electrical force (energy) that drives the current between two points.
Measured in terms of volts (V)
2CurrentThe flow of electric charge or the rate of flow of electric charge.
Denoted by the letter I, and measured in amperes (A)
Always move rom high voltage to low voltage
3ResistanceMeasure of the opposition to the flow of steady electrical current.
Resistance (R) is measured in ohms (Ω)
4Series CircuitComponents connected in series are connected along a single path, so the same current flows through all of the components
5Parallel CircuitsThe electrical current to each element in the circuit is separate, so if one elements was to burn out, the other resistors would still have power.
If you add an extra element, the other elements will still have the same amount of voltage as before.
6Direct Currents(DC) is the unidirectional flow of an electric charge.
Current flows through the circuit in the same direction at all times
7Alternating Currents(AC) the flow of electric charge periodically reverses direction. The current flow passes through a regular succession of changing positive and negative values by periodically reversing its direction of flow.
8Voltage in DC circuit EquationV = volts
I = current (amps)
R = resistance (Ω)
9Voltage in AC Circuit EquationV = voltage
I = current (amps)
Phi = The phase angle in degrees by which current lags voltage in an inductive circuit
P = true power (watts)
10Power in DC Circuit EquationP = power (watts)
V = volts
I = current (amps)
11Power in AC Circuit EquationP = power (watts)
V = volts
R = resistance (Ω)
Phi = phase angle in degrees by which current lags voltage in an inductive circuit
12Resistance in DC Circuits EquationR = resistance (Ω)
Rho = resistivity of the metal
L = length (meters)
A = cross-sectional area in square meters
13Resistance in AC Circuit EquationI = impedence (Ω)
V = volts
A = amperes
14ResistorsElements of electrical and electronic systems that are designed to intentionally resist the flow of electrical current through the system at a known measurement.
Higher resistance the lower the current.
15Resistance in a Series Circuit EquationR = total resistance (Ω)
Rx = resistance of individual resistor (Ω)
16Resistance in a Parallel Circuit EquationRparallel = total resistance (Ω) in parallel
Rx = resistance of individual resistors (Ω)
17Capacitors(or condensor) is a passive electronic component consisting of a pair of conductors separated by a dielectric (insulator).
Field stores energy and produces a mechanical force between the conductors.
Measures in Farads (F)
18Capacitance in a Series Circuit EquationCseries = total capacitance in a series circuit (Farads)
Cn = individual capacitor value (Farads)
19Capacitance in a Parallel Circuit EquationCparallel = total capacitance in a series (Farads)
Cn = individual capacitor value (Farads)
20InductorOr Reactor, is a passive electrical component that can store energy in a magnetic field created by the electric current passing through it.
21Inductance in a Series Circuit EquationLseries = total series circuit inductance (Henries)
Ln = individual inductor value (Henries)
22Inductance in a Parallel Circuit EquationLparallel = total series circuit inductance (Henries)
Ln = individual value (Henries)
23Effects of Electrical Currents on the Human Body
24Electrical BurnsOccur when a person touches electrical wiring or equipment that is used or maintained improperly.
Typically burns occur on hands.
Most common shock related injury
25Arc BlastsOccur when powerful, high-amperage currents arc through the air.
Temperatures reach as high as 35,000F.
3 Hazards:
Arching gives of thermal radiation and intense light, and can cause burns.
Can produce a considerable pressure wave blast
Can cause many copper and aluminum components to melt and create molten metal blasted by pressure wave.
26Controlling Electrical HazardsElectricity is one of the most common causes of fires and thermal burns.
Accidents are caused by a combination of 3 factors:
Unsafe equipment/installation
Workplaces made unsafe by the environment
Unsafe work practices