Physics Unit 5

What is the equation for POWER?

• P=IV

• P=IR

• P=RV

• V=IR

What is the equation for CURRENT from power?

• P=I/V

• I=PV

• I=P/V

• I=V/P

What is the equation for VOLTAGE that includes resistance?

• V=IR

• V=I/R

• V=R/I

• V=UP

What is the equation for CURRENT that includes resistance?

• I=P/V

• I=V/R

• I=R/V

• I=RV

What is the current in a 1650 W blowdryer on a 120 V circuit?

• 13.75 A

• 198000 A

• 0.0727 A

• 1770 A

Will a 1000 W blow a 10 A breaker on a 120 v circuit?

• yes

• no

Will a 1500 W circular saw blow a 10 A breaker on a 120 v circuit?

• yes

• no

How many kWh is used by a 100 W lightbulb running on a 115V circuit for 8 hrs a day for 30 days?

• 24 kWh

• 2760000 kWh

• 27600 kWh

• 209 kWh

How many kWh is used by a 7.0 W lightbulb running on a 120V circuit for 12 hrs a day for 30 days?

• 2.52 kWh

• 302400 kWh

• 43200 kWh

• 21 kWh

Which property of a resistor shows the energy that the resistor uses?

• voltage

• current

• power

• resistance