Electric Power

Why are the wires of a toaster coated in plastic?

• Plastic is stronger than other materials

• Plastic is a good electrical conductor

• Plastic protects people from electricity because it is an insulator

• Only plastic can be made into the right shape of a wire

To prevent overload and overheating of wires

• fuses are used

• circuit breakers are used

• fuses and circuit breakers are used

• fuses and resistor are used

Identify the symbol-

• Electric Bulb

• Electric Cell

• Battery

• Switch in ON position

• Switch in OFF position

At home, you noticed that a portion of an electrical wire is worn out, exposing its metallic part. What do you think might happen if you will just ignore this problem?

• short circuit may happen

• circuit is of better condition

• overloading may not happen

• nothing happens when someone touches the wire

If you replace the paper clip with a plastic spoon, what happens?

• The bulb doesn't light

• The bulb is dimmer

• The wires get hot

• There is no change

Tags

NGSS.HS-PS2-5

An electrical ground provides a alternative path for current if something goes wrong in a circuit or device.

• true

• false

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 W

• 170 A

• 1.7 V

• 1.7 W

When given the voltage and the current, which equation of Power should you use?

• Voltage x Current

• Current² x Resistance

• Both

Watts is the unit of...

• Power

• Current

• Voltage

• Resistance 

What is the current flowing into a microwave oven that requires 700 W of power if the voltage difference is 120 V?

• 4.3A

• 6.3 A

• 5.83 A

• none

Tags

NGSS.HS-PS2-5