Mains Electricity

An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?

• Nichrome conducts more current than copper, so more heat can be generated.

• Nichrome has higher resistance than copper, so more heat can be generated.

• Nichrome has higher voltage than copper, so more heat can be generated.

• Nichrome are cheaper than copper, so it is more economical.

Tags

NGSS.MS-PS1-4

the type of current that is used in mains electricity

• appealing current
• diverting current
• alternating current
• direct current

measure of power

• watt
• ohm
• volt
• amp

What is the power of a 20V bulb with 5A through it?

• 100W
• 100V
• 6.3W
• 6.3A

What is the current through a 11V bulb with a power of 99W?

• 9W
• 9A
• 60V
• 60A

A _________ is a plug or cartridge containing a strip of metal that melts when more than a specified amount of current passes through it.

• fuse
• breaker
• circuit
• panel

Which wire is connected to a fuse in a plug?

• Live

• Neutral

• Earth

• Positive

Which one is a Fuse?

• 
• 
• 
• 
• 

What is another Equation for Power?

• Power = Potential Difference x Current

• Power = Potential Difference / Current

• Power = Current / Potential Difference

What are the Equations for Energy Transferred? Choose 2

• Energy Transferred = Power x Time

• Energy Transferred = Power / Time

• Energy Transferred = Charge Flow x Potential Difference

• Energy Transferred = Charge Flow / Potential Difference