Electrical Safety
What does LOTO stand for, and what is its purpose?
Lockout-Tagout; to isolate energy sources and prevent accidental startup
What is the smallest unit of an element?
Atom
What is the standard alloy ratio for hand soldering?
40% tin, 60% lead
What are the three main components of a basic electrical circuit?
Source, load, conductors
What tool is used to measure electrical resistance?
Multimeter
What is the formula for Ohm’s Law?
V = IR
What device prevents excessive fault currents through the body?
Ground-Fault Circuit Interrupter or GFCI
What are the three subatomic particles found in an atom?
Protons, neutrons, electrons
What is a common defect caused by insufficient heat during soldering?
Cold solder joint
What is the primary difference between AC and DC?
AC flows in both directions, DC flows in one direction
Why should metal ladders not be used in electrical work?
They conduct electricity and can cause shocks
If a circuit has a voltage of 12V and a resistance of 4 ohms, what is the current?
3A; I = V/R
Name two types of PPE used for electrical safety.
Insulated gloves, safety glasses
What is the unit of electrical charge, named after a French scientist?
Coulomb
What is the function of a heat sink during soldering?
To protect components from excessive heat
What type of circuit has multiple paths for current flow?
Parallel circuit
What are the two main types of wire insulation?
Thermoplastic, Teflon
A resistor has a resistance of 10 ohms, and the current is 2A. What is the voltage?
20V; V = IR
What is the primary purpose of grounding in electrical systems?
To provide a safe path for electrical faults to the ground
Define ionization.
The process where an atom gains or loses an electron, creating a charged ion
Name two safety precautions to follow when using a soldering iron.
Keep the iron in its stand, avoid touching the hot tip
How is resistance measured?
In ohms, represented by the symbol Ω\OmegaΩ
What system measures conductor diameter based on mils?
Circular mil system
What is the resistance of a circuit if the voltage is 24V and the current is 6A?
4 ohms; R = V/I
What is the OSHA-recommended ladder type for electrical work?
Fiberglass ladder
What law explains the relationship between voltage, current, and resistance?
Ohm's Law; V=IRV = IRV=IR
What is a bridging defect in soldering?
Unintentional electrical connections between components
What is conventional current flow theory?
Current flows from positive to negative
Name one use of circuit design software.
Simulate circuits, create materials lists, or generate PCB patterns
Calculate the power dissipated by a 5-ohm resistor with a current of 2A flowing through it
20W; Power = I²R