'Ohm' My Goodness
This unit measures electrical resistance.
What is an 'ohm'
This unit measures electrical power and sounds like a question.
What is a watt
This must always be worn when working with live electrical components
What are Insulated Gloves
HVAC techs use this tool to measure volts, amps, and ohms.
What is a multimeter
This HVAC superstar always keeps it cool under pressure. What component regulates refrigerant flow in a system?
What is the Metering Device
(TXV = Thermostatic Expansion Valve)
True or False: Voltage is the flow of electrons through a conductor.
What is False
(Voltage is the pressure that pushes electrons; current is the flow. Current is the flow of electrons through a conductor.)This law relates voltage, current, and resistance in a circuit.
What is Ohm’s Law
Before working on any electrical system, you should always do this to the power.
What is turn it off or disconnect it
This tool is used to strip insulation off wires without damaging the copper.
What are wire strippers
In the world of HVAC celebrities, this one’s always blowing hot and cold. What part moves air through the system?
What is the Blower Motor
What happens to the current in a circuit if the resistance increases but the voltage stays the same?
What is the current decreases
This is what happens when you connect a 120V power supply to a 24V contactor coil.
What is a blown fuse or fried contactor coil
This tag-out system is used to prevent accidental energizing of equipment.
What is lockout/tagout
This tool clamps around a wire to measure current without disconnecting it.
What is a clamp meter
This famous HVAC figure is known for breaking up with heat. What component removes heat from the refrigerant?
What is the Condenser Coil
What is the formula for Ohm's Law?
V = I x R
(Voltage = Current x Resistance)?
This is the reason your circuit breaker keeps tripping when you plug in your coffee maker and vacuum at the same time.
What is an overloaded circuit
This type of burn can result from an electrical arc flash.
What is a thermal burn
This tool is used to remove refrigerant from a system before servicing.
What is a recovery machine
This HVAC VIP is always in control. What component turns the system on and off based on temperature?
What is a Thermostat
If a circuit has a voltage of 12 volts and a resistance of 4 ohms, what is the current?
What is 3amps
(Solution: I = V/R = 12/4 = 3amp)
This is the formula used to calculate electrical power.
What is P = V × I
This is the number one rule of electrical safety in HVAC.
What is “Always assume a wire is live until proven otherwise”
This diagram is commonly used in HVAC and electrical systems to show control logic in a format that is read from left to right and top to bottom
What is a ladder diagram
This star of the HVAC scene is always under pressure. What tool is used to measure system pressure?
What is a Manifold Gauge Set