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Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

What is the unit of electric current?

A

Ampere (A)

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2
Q

True or False: Voltage is the measure of the energy per unit charge.

A

True

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3
Q

Fill in the blank: The formula for calculating resistance is ____ = Voltage / Current.

A

Resistance

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4
Q

What does Ohm’s Law state?

A

V = IR (Voltage = Current × Resistance)

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5
Q

What is the unit of electric charge?

A

Coulomb (C)

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6
Q

Multiple Choice: Which of the following is a conductor? A) Wood B) Copper C) Plastic D) Rubber

A

B) Copper

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7
Q

What is the formula for electric power?

A

P = IV (Power = Current × Voltage)

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8
Q

True or False: A series circuit has the same current flowing through all components.

A

True

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9
Q

What is the total resistance in a series circuit with three resistors of values R1, R2, and R3?

A

R_total = R1 + R2 + R3

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10
Q

In a parallel circuit, how is the total current related to the individual currents?

A

The total current is the sum of the individual currents.

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11
Q

What is the function of a fuse in an electrical circuit?

A

To protect the circuit by breaking the connection if the current exceeds a certain level.

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12
Q

Multiple Choice: Which law relates the voltage, current, and resistance in an electrical circuit? A) Newton’s Law B) Ohm’s Law C) Kirchhoff’s Law D) Faraday’s Law

A

B) Ohm’s Law

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13
Q

What is the principle of conservation of charge?

A

The total electric charge in an isolated system remains constant.

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14
Q

Fill in the blank: The energy transferred by an electric current is measured in _____.

A

Joules (J)

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15
Q

What is the difference between alternating current (AC) and direct current (DC)?

A

AC changes direction periodically, while DC flows in one direction.

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16
Q

True or False: A voltmeter is connected in series with the component to measure voltage.

A

False

17
Q

What does a capacitor do in a circuit?

A

Stores electrical energy temporarily.

18
Q

Multiple Choice: Which component is used to limit the current in a circuit? A) Capacitor B) Resistor C) Inductor D) Diode

A

B) Resistor

19
Q

What is the formula for total resistance in a parallel circuit with two resistors, R1 and R2?

A

1/R_total = 1/R1 + 1/R2

20
Q

True or False: The voltage across each component in a parallel circuit is the same.

A

True

21
Q

What is Kirchhoff’s first law?

A

The total current entering a junction equals the total current leaving the junction.

22
Q

Fill in the blank: The power dissipated in a resistor can be calculated using the formula P = ____ × R.

A

I² (Power = Current squared × Resistance)

23
Q

What does the term ‘electrical efficiency’ refer to?

A

The ratio of useful power output to total power input.

24
Q

Multiple Choice: What is the primary function of a transformer? A) Convert AC to DC B) Increase or decrease voltage C) Store energy D) Measure current

A

B) Increase or decrease voltage

25
Q

What happens to the resistance of a conductor as its temperature increases?

A

The resistance typically increases.

26
Q

True or False: Insulators allow electric current to flow freely.

A

False

27
Q

What is the purpose of grounding in electrical systems?

A

To provide a safe path for excess current to flow to the earth.

28
Q

Kirchoff’s first law?

A

The total current entering a junction is equal to the total current leaving the junction

29
Q

Kirchoff’s second law.

A

For a complete circuit loop the sum of e.m.f. is equal to the p.d.s around the loop

30
Q

How to add resistors in parallel?

A

Total resistance is the reciprocal of the resistance
1/r + 1/r + 1/r = 1/tr

31
Q

R + R + R = tR

A

Equation for resistance in series

32
Q

Two cells are pointed away from each other how to find voltage?

A

Take away larger v from smaller

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