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1st 6 Month Final > Electricity 1-7 Ch 2 review > Flashcards

Electricity 1-7 Ch 2 review Flashcards

1
Q

What 3 elements are required for a circuit?

A

Power source, conductors, and load

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2
Q

A “load” is a device that:

A

Uses electrical energy

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3
Q

What basic function do all switches perform?

A

Open and close

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4
Q

The polarity of source voltage determines in which direction current flow is in. The amount of voltages determines what?

A

How much current will flow

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5
Q

Name 2 factors that determine how much current flows in a DC circuit:

A

Voltage and resistance

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6
Q

The ease with which a metal allows current to flow is called?

A

Conductance

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7
Q

What is the best conductor?

A

Silver

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8
Q

Resistance depends on what?

A

Number of free electrons (?)

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9
Q

How can you create any resistance you want?

A

By choosing the proper metal for the conductor and making it a certain length and cross-sectional area

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10
Q

What is the unit of resistance?

A

Ohms

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11
Q

The resistance of a load is generally what compared to the resistance of the circuit wiring?

A

Much greater

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12
Q

Every power source has what?

A

Internal resistance

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13
Q

Name one or two methods of decreasing large currents in a circuit with fixed voltage?

A

Add resistance to the circuit

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14
Q

One material used to make a resistor?

A

Carbon

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15
Q

Resistors have an indication value. Actual value may vary. What is that called?

A

Resistor tolerance

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16
Q

All resistors are designed for a max current value. What is the rating called?

A

Wattage rating

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17
Q

3 advantages of a composition resistor?

A

Small, rugged, and low cost

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18
Q

A property of resistor maintaining a small tolerance under operating conditions?

A

Stability of resistor

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19
Q

When all 3 terminals of a variable resistor are connected, what is it called?

A

Potentiometer

20
Q

When only the center terminal and one other of a variable resistor are connected, what is it called?

A

Rheostat

21
Q

In ohms law, if you raise voltage, the current will?

A

Go up

22
Q

I’m ohms law, if you lower resistance…?

A

Current will go up

23
Q

It’s good practice to think of Ohm’s law in terms of:

A

Knows and unknowns

24
Q

What is power?

A

The rate of doing work

25
Q

One watt equals?

A

The power used when 1 amp of current flows through a potential difference of 1 volt.

26
Q

Power rating of working equipment (such as motors) are not based on I^2•R losses, what is it?

A

They are based mostly on the power they can use to do mechanical work

27
Q

Total power used by consumer and sold by power companies is in what unit?

A

Kilo-watt hours

28
Q

1000V= ?kV

A

1kV

29
Q

1 million volts = ? MegaVolts

A

1 MegaVolt

30
Q

Current is __________ in series circuits.

A

Constant

31
Q

When the negative terminal of a battery is connected to the positive terminal of another battery, the batteries are connected in ________?

A

Series

32
Q

When power sources are connected in series, total voltage is _________?

A

The sum of individual voltages

33
Q

If power sources are connected so their polarities are not in the same direction…..

A

They will oppose each other

34
Q

In series, total voltage drop is equal to _________

A

Source voltage

35
Q

In a DC series circuit, it’s polarity is from:

A

Negative battery terminal, through the circuit, to the positive terminal

36
Q

A short circuit is when current flows:

A

Without going through a load

37
Q

The electromagnetic circuit breaker works on the principle of:

A

Magnetism, to open the circuit

38
Q

In a parallel circuit, current _________?

A

Divides and follows different paths

39
Q

In a parallel circuit, total current _______?

A

Is the sum of branch currents

40
Q

The reciprocal method is used for what in a circuit?

A

Total resistance

41
Q

Power consumed in a circuit is _______?

A

Additive

42
Q

Most resistor failures are a result of ____________?

A

Heat generated in resistor by current flow

43
Q

A good conductor has __________ resistance, and good insulators have _________ resistance.

A

Low; high

44
Q

What determines the resistance of a conductor?

A

Cross-sectional area and length

45
Q

EMF is measure in ________?

A

Volts

46
Q

Kirchhoff’s first law is?

A

Sum of voltage drops in a closed loop = Sum of EMFs in loop

1st 6 Month Final (9 decks)

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