Circuits

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31 Terms

1
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what is a circuit

A circuit is a loop of conducting material.

2
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what is a conductor

A conductor allows charge to flow.

3
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what is an insulator

An insulator slows down the flow of charge.

4
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what is a series circuit

A series circuit has only one path to conduct electricity.

5
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what is a parallel circuit

A parallel circuit has more than one path to conduct electricity.

6
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what is the most common type of circuit

Most circuits are a combination of series and parallel circuits.

7
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what is current

Current is measured in Amps and is defined as the amount of charge moving in 1 sec.

8
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what is voltage

Voltage is measured in Volts and is defined as the amount of energy in 1 coulomb of charge.

9
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what is resistance

Resistance is measured in Ohms (Ω) and is defined as the slowing of charge.

10
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what is ohm’s law used for

Ohm’s Law relates current, voltage, and resistance.

11
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what is ohm’s law

Ohm’s Law is: V = I x R, where V = voltage, I = current, and R = resistance.

12
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when does current flow

Current flows in a circuit when a voltage difference is present.

13
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how is current related to resistance and voltage

Current is directly related to voltage and inversely related to resistance.

14
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what is the total voltage in each resistor in a series circuit

In a series circuit, the total voltage is equal to the sum of the voltage across each resistor.

15
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what is the total current in each resistor in a series circuit

In a series circuit, the total current is the same through each resistor.

16
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what is the total resistance in a series circuit

In a series circuit, the total resistance is equal to the sum of all the resistors.

17
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what is the voltage in each resistor of a parallel circuit

In a parallel circuit, the total voltage is the same across each resistor.

18
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what is the total current in a parallel circuit

In a parallel circuit, the total current is equal to the sum of the current through each resistor.

19
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what happens when more resistors are added to a parallel circuit

In a parallel circuit, as more resistors are added, the total resistance decreases.

20
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what is power

Power is defined as the energy transferred in a given amount of time (1 second).

21
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what is the unit for power

Power is measured in joules / second (a.k.a., Watts).

22
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what are electrical bills based on

Electrical bills are based on the amount of power consumed in a given time period.

23
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how do you find power

Power is equal to current times voltage.

24
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ohm’s law equations

V = I ∙ R

I = V/R

R = V/I

25
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total resistance in series circuit

RT = R1 + R2 + … + Rn

26
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total resistance in parallel

1/RT = 1/R1 + 1/R2 + … +1/Rn

27
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total voltage in series

VT = V1 + V2 + … + Vn

28
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total voltage in parallel

VT = V1 = V2 = … = Vn

29
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total current in series

IT = I1 = I2 = … = In

30
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total current in parallel

IT = I1 + I2 + … + In

31
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total resistance in parallel with only two resistors

RT = R1 x R2 / (R1+R2