Starbucks drinking Electricity Flashcards

1
Q

The most sensitive instrument for measuring static electricity is…

A

An electrostatic amplifier

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2
Q

In adittion to grounding, you can also remove static charges from a very large container by…

A

Purging

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3
Q

When working with flammable liquids and vapors, you must wear shoes with

A

Leather soles

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4
Q

What’s the difference between Bonding and Grounding? (static eliminating techniques)

A

Bonding minimizes the potential difference (voltage) between objects. Grounding minimizes the potential difference between an object and the earth.

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5
Q

When you connect two or more cells together, the combination is called…

A

A battery

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6
Q

What is electromagnetism?

A

The relationship between an electric current and a magnetic field.

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7
Q

In a chemical battery, the plate where the electrons collect becomes the negative plate, called the…

A

Cathode

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8
Q

In a chemical battery, the plate that becomes positive is called the…

A

Anode

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9
Q

What’s the main difference between a primary and secondary cell?

A

A secondary cell is recharchable

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10
Q

Batteries connected in parallel have a greater…

A

Current capacity

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11
Q

Batteries connected in series have a greater…

A

Potential difference (voltage)

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12
Q

A thermocouple device produces electricity when…

A

Heated

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13
Q

A _________ ______ acts on objects due to their magnetic properies.

A

Magnetic field

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14
Q

A magnetic field’s strength is affected by

A

The speed and strength of the charge (strong=fast, weal=slow)

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15
Q

On an electromagnet, having more turns in a coil has what affect on a magnetic field?

A

Makes it stronger

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16
Q

The proportional relationship between voltage and current is called

A

Ohm’s Law

17
Q

What is the tolerance of a resistor if the 4th band is Gold? Silver?

A

Gold is +-5%. Silver is +-10%

18
Q

What does a potentiometer do?

A

Divide a fixed poetniap difference (voltage) into 2 parts

19
Q

When capacitors are connected in series, the total capacitance is found by

A

Reciprocal method

20
Q

When capacitors are connected in parallel, the total capacitance is found by

A

Adding the individual capacitances

21
Q

What does an inductor do?

A

Opposes current change in a circuit

22
Q

What is dielectric strength?

A

How much voltage the dielectric can stand without breaking down

23
Q

What is a raceway?

A

An enclosed channel for holding wires

24
Q

Per the NEC, what is the max allowed number of conductors in a conduit?

A

No more than 40% of its cross sectional area

25
Q

Inductance opposes change in

A

Current

26
Q

What is an anode in a vacuum tube?

A

Metal plate eith