Starbucks drinking Electricity Flashcards
(26 cards)
The most sensitive instrument for measuring static electricity is…
An electrostatic amplifier
In adittion to grounding, you can also remove static charges from a very large container by…
Purging
When working with flammable liquids and vapors, you must wear shoes with
Leather soles
What’s the difference between Bonding and Grounding? (static eliminating techniques)
Bonding minimizes the potential difference (voltage) between objects. Grounding minimizes the potential difference between an object and the earth.
When you connect two or more cells together, the combination is called…
A battery
What is electromagnetism?
The relationship between an electric current and a magnetic field.
In a chemical battery, the plate where the electrons collect becomes the negative plate, called the…
Cathode
In a chemical battery, the plate that becomes positive is called the…
Anode
What’s the main difference between a primary and secondary cell?
A secondary cell is recharchable
Batteries connected in parallel have a greater…
Current capacity
Batteries connected in series have a greater…
Potential difference (voltage)
A thermocouple device produces electricity when…
Heated
A _________ ______ acts on objects due to their magnetic properies.
Magnetic field
A magnetic field’s strength is affected by
The speed and strength of the charge (strong=fast, weal=slow)
On an electromagnet, having more turns in a coil has what affect on a magnetic field?
Makes it stronger
The proportional relationship between voltage and current is called
Ohm’s Law
What is the tolerance of a resistor if the 4th band is Gold? Silver?
Gold is +-5%. Silver is +-10%
What does a potentiometer do?
Divide a fixed poetniap difference (voltage) into 2 parts
When capacitors are connected in series, the total capacitance is found by
Reciprocal method
When capacitors are connected in parallel, the total capacitance is found by
Adding the individual capacitances
What does an inductor do?
Opposes current change in a circuit
What is dielectric strength?
How much voltage the dielectric can stand without breaking down
What is a raceway?
An enclosed channel for holding wires
Per the NEC, what is the max allowed number of conductors in a conduit?
No more than 40% of its cross sectional area
