ET unit 10 -- electric power

Which variable will be measured in watts?

• P

• I

• V

• W

Which variable will be measured in joules?

• P

• E

• t

• J

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

NGSS.HS-PS3-4

NGSS.HS-PS3-5

Any electrical device consumes power when -----

• the circuit is open

• it applies a force over a distance

• it is connected to a power source

• a current flows through it

How do home wiring systems manage to power so many devices without melting the wiring?

• increase the size of the wiring

• use higher voltages and carry smaller currents

• install additional power outlets to spread the current over a larger area

• utilize renewable energy sources

The rate of electrical energy transfer per unit of time

• electrical power

• voltage potential

• resistance

• amperage

How much current flows through a bulb that draws 100 W of power from a 120 V outlet?

• 12,000 W

• 0.83 A

• 0.83 W

If you triple the current through a circuit, how does the electrical power change?

• it decreases

• it stays the same

• it triples

• it quadruples

What happens to resistors if their power rating is exceeded?

• The resistor can overheat and fail

• The resistor can become more efficient

• The resistor can increase in size

• The resistor can become more conductive

A student is trying to solve a power equation. The problem gives the amount of voltage and the amount of power used. What equation would the student find useful to solve for the current?

• 
• 
• 
• 

Which type of circuit will have more power to multiple devices?

• series

• parallel