High Voltage Humor
If AC current changes direction 100 times per second, the frequency is?
50 Hz
A circuit without a load is considered a…?
shorted circuit
A limit switch does what when temperature rises?
opens
To properly use an ohm meter, the power to the appliance must be…?
off
One watt equals how many Btus per hour?
3.412
What is electromotive force also called?
voltage?
In a series circuit, electricity must pass through every what? True or False
True
In a household circuit, a switch should always be placed in which conductor?
L1
To properly use a voltmeter, the power to the appliance must be…?
on
What is the Btu/hr output of a 15 kW heater?
51,180 Btu/hr
What is current?
amperage
Each horizontal line in a ladder schematic must contain a…?
load
Why are most control circuits connected in series?
Safety
What is the best type of ladder to use near electricity?
Fiberglass or wood
What is the resistance of a heating element if it draws 8A at 115V?
14.375 ohms
The safe current-carrying capacity of a wire is called what?
ampacity
What reading would be obtained when measuring the amperage of an open circuit?
zero amps
The purpose of the limit control on a heating system is?
de-energize the gas valve if the heat exchanger overheats?
While using an A/C clamp-on amp meter, you would usually connect across how many wires?
one
What is the voltage of a heater drawing 12A with 10 ohms of resistance?
120 volts
The symbol used for electron flow is?
I
What is meant by continuity?
circuit is closed
True or False: Control voltage is always the same as line voltage.
False
What do the vertical lines in an electrical schematic represent?
L1, L2 or Neutral
Pertinent equipment information can be found on what tag?
data tag