NHIE Electrical Study Session 19
Questions with Correct Answers
What does a service drop drip loop prevent? - Answer- water entering the meter base
and panel
A subpanel in a detached building has melted insulation on a neutral conductor. What is
the most likely cause of this condition? - Answer- The neutral conductor is loose at the
terminal bar
The current MINIMUM service requirement for a new single family home is: - Answer-
100 amps
This panel appears to be (panel with a ton of wires that does not go all the way down) -
Answer- Correctly installed downstream (sub) panel
What is the flow of electricity from the source? - Answer- Source -> Transformer ->
Service Drop -> Drip Loop -> Service Mast -> Elecrical Meter -> Main Panel ->
Load/Receptacles
What is voltage and how is it expressed in Ohm's Law? - Answer- Voltage is the force of
electricity, it is expressed as E in Ohm's Law
What is current, how is it measured, and how is it expressed in Ohm's Law? - Answer-
Current is the amount of electricity moving through the conductors, it is measured in
amps and expressed as I in Ohm's Law
What is power, how is it measured, and how is it expressed in Ohm's Law? - Answer-
Power is work performed by electricity in a load, its measured in watts and expressed
as P in Ohm's Law
What is resistance, how is it measured, and how is it expressed in Ohm's Law? -
Answer- Resistance is impedence in flow of electricity, it is measured in ohms and is
expressed as R in Ohm's Law
Residential homes with single phase electrical systems usually have how much
electricity connected? - Answer- 240/120 volts, two energized conductors with 120 volts
flow between each and a grounded conductor
Home inspectors report receptacles with reversed polarity as potentially hazardous
because: - Answer- They increase likelihood of shock at connected equipment.
Questions with Correct Answers
What does a service drop drip loop prevent? - Answer- water entering the meter base
and panel
A subpanel in a detached building has melted insulation on a neutral conductor. What is
the most likely cause of this condition? - Answer- The neutral conductor is loose at the
terminal bar
The current MINIMUM service requirement for a new single family home is: - Answer-
100 amps
This panel appears to be (panel with a ton of wires that does not go all the way down) -
Answer- Correctly installed downstream (sub) panel
What is the flow of electricity from the source? - Answer- Source -> Transformer ->
Service Drop -> Drip Loop -> Service Mast -> Elecrical Meter -> Main Panel ->
Load/Receptacles
What is voltage and how is it expressed in Ohm's Law? - Answer- Voltage is the force of
electricity, it is expressed as E in Ohm's Law
What is current, how is it measured, and how is it expressed in Ohm's Law? - Answer-
Current is the amount of electricity moving through the conductors, it is measured in
amps and expressed as I in Ohm's Law
What is power, how is it measured, and how is it expressed in Ohm's Law? - Answer-
Power is work performed by electricity in a load, its measured in watts and expressed
as P in Ohm's Law
What is resistance, how is it measured, and how is it expressed in Ohm's Law? -
Answer- Resistance is impedence in flow of electricity, it is measured in ohms and is
expressed as R in Ohm's Law
Residential homes with single phase electrical systems usually have how much
electricity connected? - Answer- 240/120 volts, two energized conductors with 120 volts
flow between each and a grounded conductor
Home inspectors report receptacles with reversed polarity as potentially hazardous
because: - Answer- They increase likelihood of shock at connected equipment.
