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WorksheetsUnit 9: Current and Circuits
Total questions: 20
Worksheet time: 12mins
A positive charge of 1.5 x10^-8 C experiences a force of 0.025 N to the left in an electric field. What is the magnitude of the field? E = F/q'
1.7 x 10^6 N/C
2.0 x 10^6 N/C
3.4 x 10^6 N/C
1 x 10^6 N/C
An electric field produces forces that can _____.
produce electric charges
create energy
do work
run an engine
A test charge is used to _____ an electric field.
create
change
measure
destroy
What are electric field lines used for?
to calculate the force on a charged body
to find the direction of a current in space
to explain why charged bodies exert a force on each other
to determine the strength of an electric field
What did Millikan use a uniform electric field between two parallel plates to measure?
charge of an electron
electric fields near conductors
the electric potential difference caused by X-rays
the terminal velocity of a charged oil drop
Choose the correct term:
the quantity that relates the force exerted on a charge to the
size of the charge
volt
electric field strength
equipotential
capacitance
As an electric field becomes stronger, the field lines should be drawn ____ .
closer together
farther apart
thicker
thinner
What magnitude of force is exerted on a 19.9 C charge by an electric field of 4.54 x10^-4 N/C? F=Eq'
5.01 x 10^-3 N
4.5 x 10^-3 N
2.3 x 10^-3 N
4.1 x 10^-4 N
A 6.0-V battery delivers a 0.5 A current to an electric motor
connected across its terminals. What is the power of the motor? P=IV
14 W
2 W
7 W
3 W
A current of 0.50 A is carried through a lamp when it is connected to a 120-V source. What is the resistance of the lamp?
2.4 x 10^2 Ohms
5.5 x 10^2 Ohms
7 x 10^2 Ohms
1.5 x 10^2 Ohms
A battery can be used to convert _____ to electric energy.
electric current
electrons
chemical potential energy
metal particles
In an electric circuit diagram, the conventional direction of current flow is _____.
from the positive terminal
from the negative terminal
toward the resistor
away from the resistor
What unit is used by electric companies to measure energy sold?
kilowatt-hours
joules
amperes
ohms
The diagram shows a simple electric circuit. How much would the power increase if the 6.0-V battery were replaced with a 9.0-V battery?
1.3 W
2.3 W
2.5 W
4.0 W
A 9.0 volt battery delivers a 0.50-A current to a bulb connected across its terminals. What power is delivered to the bulb?
0.056 W
4.5 W
18 W
41 W
If a 9.0-V battery is connected to a circuit with 0.55 A of current, what is the resistance?
5.0 Ohms
6.1 Ohms
16 Ohms
45 Ohms
If four electric devices are connected in a series circuit, the number of current paths is equal to ____ .
two
four
three
one
If three resistors are connected in parallel, there are ____ current paths in the circuit.
one
two
three
four
In an electric circuit, ____ are switches that act as safety devices.
fuses and circuit breakers
fuses and voltage dividers
ammeters
combined circuits
What is the equation to find current in a series of three resistors?
I = V/(R1 + R2 + R3)
I = V/(R1 × R2 × R3)
I = V(R1 × R2 × R3)
I = V(R1 + R2 + R3)
