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Electrifying Physics! Trivia Quiz

This quiz will challenge your knowledge in the topic of electricity.

A multiple-choice quiz by doublemm. Estimated time: 6 mins.

Author
doublemm

Time
6 mins

Type
Multiple Choice

Quiz #
308,278

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
5 / 10

Plays
1560

Awards
Top 20% Quiz

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Current flows in a circuit due to the flow of electrons. If current flows past a point for a period of time the total charge which had flowed can be found by multiplying current by time. In what units would this charge be expressed in? Hint

Coulombs

Teslas

Farads

Ohms

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Question 2 of 10

2. Power and energy are often referred to in physics. There are several types of energy and therefore several different calculations to find a value for energy. However, how can electrical energy be calculated? Hint

(Current x voltage) /time

Current x voltage

Current /(voltage x time)

Current x voltage x time

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Question 3 of 10

3. Ohm's law states that the current flowing between two points is directly proportional to the voltage across the two points. Some components of a circuit obey Ohm's law such as a passive resistor. Will a filament bulb obey Ohm's law?

Yes

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Question 4 of 10

4. A diode only allows current to flow one way in a circuit. Due to the sensitivity of a diode it must be protected by a resistor and so current stays constant until about +0.7V, where current flow increases rapidly. However, if the voltage is reversed and is raised to a high enough value, current will flow in the opposite direction. What is this value known as? Hint

The threshold voltage

The breakdown point

The terminal point

The minimum opposite flow

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Question 5 of 10

5. In a parallel circuit we are told that current is the "sum" and voltage is the "same".
In a series circuit this is the exact opposite. Who's law states that the current entering and leaving a closed series circuit are equal? Hint

Kirchhoff's 2nd law

Kirchhoff's 1st law

Ampere's 1st law

Ampere's 2nd law

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Question 6 of 10

6. In a series circuit, when two or more resistors are connected the circuit can be known as a potential divider as the total potential difference is divided between the resistors.
Will a 100 Ohm resistor have a larger potential difference across it than a 10 Ohm resistor?

Yes

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Question 7 of 10

7. We can measure the voltage across a component using a voltmeter. The potential difference across a battery in an open circuit is greater than the total potential difference across the components (i.e. external to the battery).
This is due to the "internal resistance" of the battery. What is the difference between these two potential difference readings known as? Hint

Missing volts

Lost volts

Phantom volts

Hypothetical volts

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Question 8 of 10

8. Resistance is directly proportional to the length of wire it flows through and is inversely proportional to the cross-sectional area of the wire it flows through. The resistivity of the material the current is flowing through also determines resistance. Which letter of the Greek alphabet is used to represent resistivity? Hint

Chi

Eta

Rho

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Question 9 of 10

9. We use electricity from the mains supply everyday. The root mean squared voltage of the mains supply is used as an average as otherwise the voltages would cancel out (as the mains is AC). If we are provided with the peak voltage, how would we find the root mean squared voltage? Hint

Peak voltage x 2

Peak voltage x square root of 2

Peak voltage/2

Peak voltage/square root of 2

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Question 10 of 10

10. Cathode Ray Oscilloscopes (CRO) can be used to show whether a supply is AC or DC, if it has high or low frequency and if the signal is varying or not. What could we say about a source that shows a straight horizontal line above the centre of the CRO screen? Hint

+DC, time base off, signal varying

AC, time base on, signal constant

AC, time base off, signal varying

+DC, time base on, signal constant

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Quiz Answer Key and Fun Facts

Answer: Coulombs

The coulomb is named after Charles-Augustin de Coulomb.
The charge of an electron is -1.6 x 10 to the power -19 coulombs. You can therefore calculate the number of electrons which have flowed past a particular point by dividing the total charge by the charge of one electron.

Answer: Current x voltage x time

No matter how you calculate energy, all can be expressed in joules.
Electrical power can be found by current x voltage, as a watt is a joule per second.

Answer: No

Resistance increases with temperature and so as current flows through the bulb, causing it to light up, the resistance in the metal filament will increase. The current and voltage across the filament will therefore not be directly proportional.
Eventually the filament will become saturated with electrons and so current will no longer increase as voltage is increased.

Answer: The breakdown point

Most diodes will have a breakdown point between -30V and -40V. At this point resistance in the diode to current flowing in the opposite direction "breaks down" and current flow sharply increases.

5. In a parallel circuit we are told that current is the "sum" and voltage is the "same". In a series circuit this is the exact opposite. Who's law states that the current entering and leaving a closed series circuit are equal?

Answer: Kirchhoff's 1st law

This is because in a series circuit there is only one "route" the current can take and so it is not divided.
Kirchhoff's 2nd law states that the potential difference supplied to a circuit is equal to the sum of the potential differences across the individual components of the circuit.

6. In a series circuit, when two or more resistors are connected the circuit can be known as a potential divider as the total potential difference is divided between the resistors. Will a 100 Ohm resistor have a larger potential difference across it than a 10 Ohm resistor?

Answer: Yes

The current flowing through both resistors is the same (as this is a series circuit). Current is equal to voltage/resistance and so if resistance increases so must voltage.

7. We can measure the voltage across a component using a voltmeter. The potential difference across a battery in an open circuit is greater than the total potential difference across the components (i.e. external to the battery). This is due to the "internal resistance" of the battery. What is the difference between these two potential difference readings known as?

Answer: Lost volts

The potential difference in an open circuit is known as the electro-motive force.
The potential difference external to the battery is known as the terminal potential difference.
The lost volts can be calculated by multiplying together the internal resistance and the current.

Answer: Rho

Resistance can be calculated by (resistivity x length)/area.
Resistivity is therefore defined as the resistance per unit length for an area of material.

Answer: Peak voltage/square root of 2

The root mean squared voltage of the mains supply is 240V (peak voltage is therefore 340V).
Also, the frequency of the mains is 50Hz.

This is for the mains supply in the UK.

Answer: +DC, time base on, signal constant

It is +DC as the signal is above the centre.
The time base is on as a line is shown rather than a dot.
The signal is constant as the line is straight.

Source: Author doublemm

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