Download Electric Current Test Review Sheet Name Unit The unit for power

Electric Current Test Review Sheet
Name ___________________
Unit
1.
2.
3.
4.
5.
The unit for power.
___ ___ ___ ___
The unit for charge.
___ ___ ___ ___ ___ ___ ___
The unit for kinetic energy.
___ ___ ___ ___ ___
The quantity that represents potential difference.
___ ___ ___ ___ ___
The quantity represented by the kilowatt hour.
___ ___ ___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___ ___
Equations
1. The equation for power
___ = ___ x ___
2. The equation for Ohm’s Law
___ = ___ x ___
3. In the equation for Ohm’s Law, represented by the “I” ___ ___ ___ ___ ___ ___ ___
4. In the equation for Coulomb’s Law, represented by the letter “q”___ ___ ___ ___ ___ ___
5. The equation to solve for current which includes charge and time.
___ = ___/___
Vocabulary
1. The flow of positive charges in a circuit ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___ ___ ___
2. The flow of electric charge
___ ___ ___ ___ ___
3. The rate at which energy is consumed ___ ___ ___ ___ ___
4. The quantity that slows down current in a circuit___ ___ ___ ___ ___ ___ ___ ___ ___ ___
5. The quantity that expresses the amount of energy in a charge ___ ___ ___ ___ ___ ___ ___
Circuits
1.
2.
3.
4.
5.
The type of circuit in which one pathway exists ___ ___ ___ ___ ___
A drawing of a circuit using symbols
___ ___ ___ ___ ___ ___ ___ ___ ___
The symbol that represents a battery in a circuit
The type of circuit in which total resistance is greater than a single resistor___ ___ ___ ___ ___
The total voltage drop across each resistor in a parallel circuit is ____ the total voltage in the
circuit. ___ ___ ___ ___ ___
___ ___
Resistance
1.
2.
3.
4.
5.
The unit for resistance. ___ ___ ___
The letter that represents resistance in Ohm’s Law. ___
The relationship between current and resistance. ___ ___ ___ ___ ___ ___ ___ ___
The purpose of a resistor in a circuit. ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
How the current changes if adding resistors in a circuit when voltage does not change.
___ ___ ___ ___ ___ ___ ___ ___ ___
Word Problems
1. A 15 ohm and a 5 ohm resistor are connected in series. What is the equivalent resistance? ___
___ ___ (number and unit)
2. A lamp uses 6.0 V and 12 W when it is operating. What is the current through the lamp? ___ ___
(number and unit)
3. The current through a light bulb connected across the terminals of a 120 V outlet is 0.5 A. How
much power is supplied to the bulb? ___ ___ ___ (number and unit)
Electric Current Test Review Sheet
Name ___________________
4. A flashlight bulb is rated at 9.0 W. If the light bulb drops 3.0 V, how much current goes through
it? ___ ___ (number and unit)
5. The current through the starter motor of a car is 120 A. If the battery maintains 10 V across the
motor, how much electric energy is delivered to the starter in 10 s? (Hint: calculate power first)
___ ___ ___ ___ (number and unit)
Current
1. The definition of electric current. ___ ___ ___ ___
___ ___
___ ___ ___ ___ ___
2. One way in which current can be increased in a circuit.
3. The type of relationship shown between current and voltage
___ ___ ___ ___ ___ ___
4. The behavior of current in a parallel circuit. ___ ___ ___ ___
___ ___
5. The current that passes through a 6 ohm resistor and uses 12 V. ___ ___ (number and unit)
Devices
1.
2.
3.
4.
A device for measuring current. ___ ___ ___ ___ ___ ___ ___
A device for measuring voltage. ___ ___ ___ ___ ___ ___ ___ ___ ___
The type of connection used for an ammeter ___ ___ ___ ___ ___
An automatic switch that opens when the current reaches a value greater than the rated value
in the circuit. ___ ___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___ ___ ___
5. An outlet that prevents injuries that are caused when an electric appliance falls into water. It
contains an electric circuit that detects an extra current path and opens the circuit.
___ ___ ___ ___ ___ ___
___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
___ ___
Hodge Podge
1.
2.
3.
4.
5.
A mobile source of electric power
___ ___ ___ ___ ___ ___ ___
The man who created the first battery to produce a lasting current
___ ___ ___ ___ ___
Three types of energy which electric energy can be converted to
Type of circuit in which current is the same through each branch. ___ ___ ___ ___ ___ ___
Type of circuit in which voltage is the same through each branch.
___ ___ ___ ___ ___ ___ ___ ___
Other things to know:
 How does the diameter, material and and length of a wire effect the electrical resistance
 How is the cost of electrical energy calculated? (Electric energy x cost of each kilowatt hour)
 Draw a schematic which includes a battery, lamp, ammeter, resistor, and a voltmeter
 Know at least three differences between series and parallel circuits
 Calculate power, resistance and current using the equation P = IV
 Calculate voltage, current, and resistance using the equation V = IR
 Be able to express in words the terms potential difference, resistance, and current
Electric Current Test Review Sheet
Name ___________________
1. What power is supplied to a motor that operates on a 120 V line and draws 1.50 A of current?
2. An electric lamp is connected to a 110 V source. If the current through the lamp is 0.75 A, what
is the power consumption of the lamp?
3. A 110 W lamp draws .909 A. What is the lamp’s resistance?
4. A lamp is labeled 6.0 V and 12 W.
a. What current flows through the lamp when it is operating?
b. How much energy is supplied to the lamp in 1,000 s?
5. In common metals, resistance increases as the temperature increases. An electric toaster has a
resistance of 12.0 ohms when hot.
a. What current will flow through it when it is connected to 125 V?
b. When the toaster is first turned on, will the current be more of less than during operation?
Electric Current Test Review Sheet
Name ___________________
6. The resistance in a lamp is 230 ohms. The voltage is 115 V when the lamp is turned on.
a. What is the current in the lamp?
b. If the voltage rises to 120 V, what is the current?
7. How much does it cost to run a 2.0 W clock for one year (365 days) if it costs $.0353 per kWh?
8. A small electric furnace that expends 2.0 kW of power is connected across a potential difference
of 120 V.
a. What is the current through the circuit?
b. What is the resistance in the furnace?
c.
What is the cost of operating the furnace for 24.0 H at 7.0 cents/kWh?