Level 2 electrical revision

Valence electrons are the electrons in the

• the electrons in the nucleus
• the electrons in the innermost shell
• the electrons in the middle shell
• outermost shell of an atom

How many electrons are there in a copper atom

• 27
• 30
• 32
• 29

The nucleus of an atom is made up of

• electrons and protons
• protons and neutrons
• neutrons and electrons
• protons and electrons

In electron flow electrons move from

• positive terminal to the negative terminal
• negative terminal to the positive terminal
• from the top to the bottom
• from the middle to the sides

What current will flow when 9 volts is applied to a 3 ohm resistance?

• 2 amperes
• 6 amperes
• 3 amperes
• 4 amperes

What voltage is needed to cause a current of 15 amps to flow through a resistance of 8 ohms?

• 100 volts
• 150 volts
• 120 volts
• 80 volts

What resistance is needed to cause a current of 5 amps to flow when 500 volts is applied?

• 50 ohms
• 300 ohms
• 100 ohms
• 200 ohms

What is the power of an unknown device if a current of 35 mA flows through the device when it is connected to 3 V?

• 3.5 W
• 0.105 W
• 105 mW
• 0.035 W

The meter shown is measuring ....

• Voltage

• Current

• Power

• Resistance

To measure continuity of protective conductors we would use a ...

• voltmeter

• ohmmeter

• ampmeter

• ohmmeter