Unit 4 - Electricity

What is the unit of current?

• Volts (V)

• Ohms (Ω)

• Amperes (A)

• Joules (J)

What is the conventional direction of current flow?

• Flow of electrons

• Flow of ions

• Flow of positive charge

• Flow of neutrons

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What device is used to measure current?

• Voltmeter

• Ammeter

• Thermistor

• Resistor

What is the potential difference across each branch in a parallel circuit?

• Different for each branch

• The same across every branch

• Zero for all branches

• Only across the first branch

What can overheating of cables lead to?

• Increased resistance

• Melting of the insulation and fire

• Lower current

• Reduced voltage

What can damp conditions cause in electrical equipment?

• Increased efficiency

• Electric shock

• Reduced current

• Lower voltage

What is a fuse?

• A thick piece of wire

• A thin piece of wire that melts if the current is too high

• A device that increases voltage

• A component that decreases resistance

Tags

NGSS.HS-PS3-5

What is the advantage of a circuit breaker over a fuse?

• It is cheaper

• It can be reset and used again

• It is larger

• It is more complex

What materials are used in double insulation?

• Metal casings

• Plastic casings

• Rubber casings

• Glass casings

What is the unit of energy transferred in an electrical circuit?

• Joules (J)

• Watts (W)

• Volts (V)

• Amperes (A)