Electronics Information - Electricity

The electric power consumed by an electric kettle is 2000 W. If the voltage being supplied to the kettle increases 4 times and the current flowing through the kettle is decreased by half, what would be the effect on the power consumed by the kettle?

The electric power would double.

Electrical power can be calculated with the following formula P = (I × V). What does the letter I represent in this formula?

Current.

What is the voltage across and current through the resistor R when the switch is open?

0 A Current; 0 V voltage.

A fuse rated at 0.8 A blows when the switch is closed. If an 80 V supply is supplying power to the circuit, what would be the minimum possible value of the resistance for which the current flows through the circuit?

100 ohms.

Current flows _________.

Both options "From Higher Potential to Low Potential" and "Towards least resistance".

A circuit with a 120-volt power supply is protected by a 10-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

1200 W.

The TWO MOST commonly used metals in solder are _________.

Tin and lead.

Which of the following is the CORRECT definition of an electrical cell?

A device that is capable of changing some form of energy (such as chemical energy) into electricity.

Current I is passing through a load of resistance R. If the voltage across the load doubles and the resistance of the load is reduced by half then what is the amount of current passing through the load?

4I

What would happen to the voltage if the current doubles and the resistance increases four times?

The voltage will increase 8 times.

How much current will flow through the resistor R2 if R1 = R2 = 10 ohms and R3 = 20 Ohms?

1.5 amperes.

The generated force on a current carrying wire can be increased by _________.

Increasing the amount of current flowing.

An ammeter measures what?

Current.

How would you connect 8 [15V 25A] batteries to achieve a combined power output of 15V 200A?

Parallel.

Which of the following is NOT needed to produce electrical power from fossil fuels?

A dam.

A microwave is consuming 800 W power using a standard North American 120 V power supply. What is the approximate amount of current flowing?

7 amperes.

The current in the 4 ohm resistor is _________.

1 amp.

AM radio stations broadcast in which frequency range?

530–1,700 kHz

A circuit contains three parallel resistors. Each resistor has 3 amps flowing through it. What is the total current flowing through the circuit?

9 A

Electric power can be measured by what type of instrument?

Wattmeter.

What is the load in this basic circuit model?

C

Most 12 V car batteries are made up of six individual cells connected in series. What is the voltage of each cell in a car battery?

2 V.

The amount of energy used by a consumer in their home or business is typically measured in _________.

Kilowatt-hours.

If a circuit has 8 volts and 4 ohms of resistance, what will the current equal?

2 amps.

In electrical wiring, which of the following are proportional?

The diameter of the wire and the amount of the current.

What voltage will cause an 8 Amp current to flow through a 24 ohm resistor?

192 volts.

How many valence electrons are present in most semi-conductor materials?

4

Copper is a good conductor of electricity because _________.

It demonstrates a low amount of resistance.

Which of the following statements is CORRECT?

Conventional current flows from positive terminal of the source to its negative terminal through the circuit.

An AA battery produces a potential difference of 1.5 V. Four AA batteries are placed in series to power a portable FM radio. What is the total voltage of the radio?

6.0 V

What type of electrical circuit is depicted below?

Series-parallel circuit.

A typical home outlet has how much voltage?

120 volts.

The measurement "mil" refers to _________.

One thousandth of an inch.

If an electrical circuit is interrupted, which of the following will result?

Open circuit.

Which of the following statements is CORRECT?

Atomic Number is the number of protons present in the nucleus of any material.

If three different resistors are connected in parallel and a voltage is applied across them, which of the following statements is CORRECT?

The greatest resistance has the least power loss across three resistances.

Which of the following is NOT a unit of power?

None of the answers is correct.

Two 8-ohm speakers are connected in parallel to an amplifier with a 24-volt output. What is the voltage across each speaker?

24 volts.

Which of the following statements are CORRECT regarding a Voltmeter?

A voltmeter is used in parallel to a circuit.

Three amps equals how many milliamps?

3,000

What is the total amount of energy if a 12C charge produces 3 V?

36 J

A current meter is connected to a circuit as shown. What does the current meter read?

4.5 amperes.

What is the reading on the kilowatt-hour meter shown below?

5602

Which of the following statements is INCORRECT regarding Ohm's Law?

Voltage is inversely proportional to the resistance.

What is the voltage in a circuit with 10 amps of current and 6 ohms of resistance?

60

What device would you use to measure electrical resistance in a circuit?

Ohmmeter.

A 120 V light bulb is rated for 40 watts. What is the light bulb's current rating?

1/3 A

What is the reading on the kilowatt-hour meter shown below?

8282

Most wires are made from _________.

Copper.

Which of the following is the MOST conductive element?

Silver.

An engineer who wants to document an electric circuit would create which of the following?

A schematic.

What is the frequency of the alternating voltage and current typically used in the United States?

60hz.

What is the total resistance when two 10 ohm resistors are connected in series?

20 ohms.

In a closed circuit, what is the state of the circuit components?

All components are connected in a complete loop for current flow.

How does a semiconductor differ from a conductor in terms of electrical conductivity?

Semiconductors have intermediate conductivity between conductors and insulators.

In a series circuit, how does the total resistance change compared to individual resistances?

Total resistance increases with each additional resistor.

What happens to the voltage across resistors in a series circuit?

Voltage is divided across series resistors based on their resistances.

Which type of material allows the free flow of electrons and offers low resistance to the movement of electricity?

Conductor.

What determines the amount of power consumed by a circuit?

Voltage and current in the circuit.

How do resistors in series-parallel circuits affect the total resistance?

Total resistance is a combination of series and parallel arrangements.

What happens to the current in a parallel circuit when an additional branch with a resistor is added?

Total current increases with an additional branch.

What is the advantage of connecting batteries in series to power a device?

Increased total voltage for higher power output.

What is the relationship between current, voltage, and resistance in a circuit as per Ohm's Law?

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

What happens to the current flow in a circuit if it is open (broken) at some point?

Current flow is disrupted at the open point.