Electrical and Hydraulic Safety Training Flashcards

Flashcards based on lecture notes for exam preparation.

Aside from liquid cooling, what kind of systems relating to hydraulics might a solar technician encounter?

None, solar technicians don't deal with high-pressure hydraulic systems.

What type of liquid is used in liquid-cooled inverters?

Ethylene glycol and water mixture

What is the function of a radiator in a liquid-cooled inverter system?

To strip heat from the ethylene glycol mixture

What is the typical operating pressure of the liquid cooling system mentioned in the lecture?

0.55 bar (approximately 8 psi)

What is used to stabilize tracking systems?

Air springs or gas struts

What is the negatively charged particle that flows from atom to atom?

Electron

What is the flow of electrons called?

Current

According to electron flow theory, from where do electrons originiate?

Negative source

What measures the force moving electrons?

Voltage

What is the rate at which electrons flow measured in?

Amperes (amps)

What is the term for an electrical circuit that gets too hot to prevent damage?

Short circuit

What do you call one end of the battery in Ohms Law terms?

High potential to low potential

In Ohm's Law, what does 'V' represent?

Voltage

In Ohm's Law, what does 'I' represent?

Current

In Ohm's Law, what does 'R' represent?

Resistance

What is the formula for calculating voltage using Ohm's Law?

Voltage = Current x Resistance (V = I x R)

What is the formula for calculating current if you know voltage and resistance?

Current = Voltage / Resistance (I = V / R)

What is the formula for calculating resistance if you know voltage and current?

Resistance = Voltage / Current (R = V / I)

What is the unit of measurement for power?

Watts

What is the formula for calculating power?

Power = Current x Voltage (P = I x V)

What is the definition of electromotive force?

Voltage, the force that moves electrons

In the garden hose analogy, what is the electrical equivalent of water pressure?

Voltage

In the garden hose analogy, what is the electrical equivalent of water?

Electrons

What is the electricl equivalent of a sprayer in the water hose analogy?

Resistor or load

What is measured when measuring a difference in potential between two points?

Voltage

What happens in a circuit when current is flowing?

Work is being done

What is the circuit component that opposes current flow?

Resistor

What unit is resistance measured in?

Ohms

What Greek symbol represents ohms?

Omega (Ω)

What happens when a space heater has a shorted circuit?

The circuit breaker trips, it will not heat up.

What type of current comes from batteries and photovoltaics?

Direct Current (DC)

What type of current is in a wall outlet?

Alternating Current (AC)

What piece of equipment makes alternating current?

Rotating Generator with Magnets

What are some devices that use DC (Direct Current)?

Laptops, phones, communication devices, LEDs, thermocouples or RTDs, PCBs

What is the key characteristic of DC (Direct Current)?

Polarity (positive and negative)

Does AC (Alternating Current) have polarity like DC?

Cycles, but no polarity

What does RMS stand for?

Root Mean Squared

In measuring AC voltage, what does a meter read when it reads an alternating current sourse?

RMS (Root Mean Squared)

When measuring current, for what situations are clamp meters used?

When a normal multimeter will not work.

What is measured in a de-energized state?

Testing resistance with the multimeter

What circuits remain constant?

Series circuits

Is voltage divided amongst circuits, or does it remain constant?

Both, voltage is divided amongst loads in parallel circuits, but remains constant in series circuits

What are the minimum capabilities needed within a multimeter?

Voltage, current, resistance, and continuity capabilities.

What do power supplies do?

Rectify AC to DC

What setting should a multimeter be set to when probing for continuity?

Set the dial to continuity, or in some cases, resistance.

At what degree Celcius are thermostats drawn either normally opened or normally closed?

Zero degrees Celcius.

If you are experiencing an overcurrent in your electrical equipment, what protects that equipment?

A breaker with an I setting trips in an open state.

If all switches are acting together as a single unit, how is that indicated on the schematic?

A dotted line.

What does a typical rectifier do?

Converts AC to DC

What does a UPS do?

Uninterruptible Power Supply, provides backup power in case of power loss.