WorksheetsPhysics Unit 5
Total questions: 29
Worksheet time: 24mins
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
What is the resistance of a bulb that has a voltage of 1.0 V and a current of 0.5 A?
2 ohms
0.5 ohms
0.25 ohms
1 ohms
What is the resistance of a resistor that has a voltage of 120 V and a current of 0.300 A?
400 ohms
36 ohms
0.0025 ohms
120 ohms
Which uses more power two resistors in parallel OR two resistors in series?
parallel
series
Which is the correct energy change for a bulb?
electrical potential energy to mechanical energy
electrical potential energy to light energy
light energy to electrical potential energy
nuclear energy to chemical energy
Two resistors are connected in parallel with a battery of 5V. The first resistor has a resistance of 20 Ω and the second resistor has a resistance of 40 Ω. There is a switch in the circuit.
Draw the circuit diagram using circuit symbols.
A 10 V cell battery is in parallel with a 15 ohm resistor and a 25 ohm resistor.
What is the total current in the circuit?
1.07A
0.25 A
17 A
40 A
How must an ammeter be put into a circuit to work correctly?
How must a voltmeter be put into a circuit to work correctly?
A power plant produces 300,000 W of power at 600 V. For the power lines, it steps up the voltage to 400,000 V. What is the current moving through the high voltage power lines?
0.750 A
50 A
1.00 A
0.250 A
A substation has an input of 650,000 W at 0.500 A. If the lines leaving the station has 200 A output, what is the output voltage?
1,300,000 V
Is power conserved in a transformer?
Why is high voltage used in power lines?
Why won't a transformer work with the wrong type of current?
Because it only works with a changing magnetic field
It relies on the principle of electromagnetic induction and repelling magnets
How is DC different from AC?
You are asked to provide evidence to a physics class that an electric current can produce a strong magnetic field. You have the following items on hand: two strong magnets, two copper plates, two nails, insulated copper wire, uninsulated copper wire, a light bulb, 2 D cell batteries, paper clips, and tape. You can choose whichever items help you. You do not need to use all the items.
Draw the items set up and label them.
You are asked to provide evidence to a physics class that an electric current can produce a strong magnetic field. You have the following items on hand: two strong magnets, two copper plates, two nails, insulated copper wire, uninsulated copper wire, a light bulb, 2 D cell batteries, paper clips, and tape. You can choose whichever items help you. You do not need to use all the items.
Which items will you use?
copper plates and tape and two strong magnets
uninsulated copper wire and paper clips and two strong magnets
insulated copper wire and D cell batteries and a nail
two strong magnets and a light bulb and and a nail
A coil of insulated copper wire is connected to a very sensitive ammeter. How must a magnet be used to create current?
Explain in depth how an electric motor works. Include a discussion of the internal electrical components.
An electric motor works based on the principle of electromagnetic induction, with internal components including the armature, magnetic field, and a connector
Explain in depth how an electric speaker works. Include a discussion of the internal electrical components and how they work with respect to electromagnetic induction.
The internal electrical components of an electric speaker, such as the magnet, coil, and diaphragm work by a current in the coil attached to the diaphragm pushes and pulls as the current changes.
