The first chemical cells were originally made of...

copper, zinc, and a saline solution

copper, iron, and a saline solution

copper, iron, and a zinc solution

copper, an electrolyte, and wires

If we double the length of a copper wire, its resistance will...

double, because resistance is proportional to the length

stay the same, because copper is an ohmic conductor

become half, because longer wires have smaller resistance

stay the same, because the material is the same

chemical energy to electrical energy

electrical energy to chemical energy

This circuit is used to...

Determine the resistance of a copper wire

Measure the current through the variable resistor

Measure the emf of the low voltage power supply

Determine the power consumed in the variable resistor

What is one of the biggest problems with having more electric cars on the streets in China?

The electricity used to charge them comes from burning coal. So, they still pollute the environment.

The roads would not be wide enough for so many cars.

They are too expensive. People would never be able to buy them.

They are faster than other cars, so it is easy to have road accidents.

When sending electrical power from a power station to our homes, a big part of the energy lost is due to the resistance in the wires. If we want to decrease that resistance, we can...

make thicker wires, because that reduces the resistance of the wires.

change the material to gold, because gold is a better conductor

make longer wires, because that reduces the resistance of the wires.

transmit electricity under the ground

This device is used to measure...

voltage, current, resistance and a few more things

What has this person just measured?

the voltage of the cell as 1.629 V

the power of the cell as 1.629 W

When the screen of the instrument is showing this, it is because...

the reading is greater than the maximum value of the scale

the instrument is broken and needs to be replaced

the instrument needs a new battery

the value being measured is 1.000

When a cell is not part of a circuit and a voltmeter is connected to it, it measures 1.502 V. When the same cell is connected to a closed circuit and the voltmeter is used again, it reads 1.378 V. Why are the two reading different?

Because 1.502V is the emf and 1.378 is the voltage, and the voltage is always smaller than the emf.

Because cells lose part of their energy with time.

Because part of the voltage of the circuit is going to the wires.

Because voltmeters oscillate a lot and we need to take an average to have a better result.

Chapter 12 - Electrical energy - AO1

Quiz

•

Science

•

11th Grade

•

Practice Problem

•

Medium

Maykell Figueira

Used 2+ times

FREE Resource

electric current

resistance

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the name of this measuring instrument?

amperemeter

ammeter

amometer

currentmeter

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Dry human skin is a good ...

electric conductor

electric insulator

electric semiconductor

electric superconductor

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The unit of electrical resistance is the

Which of these changes will decrease the resistance of a metal wire?

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How much is 1kV?

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