Forms of Energy
Is the following scenario an example of kinetic or potential energy?
Gasoline in a storage tank.
Potential Energy
An electrical property of matter that creates electric and magnetic forces and interactions is called
Electric Charge
The rate at which charges pass through a given point is a(n)
Electric Current
A set of electrical components connected such that they provide one or more complete paths for the movement of charges is a(n)
Electric Circuit
Find the resistance of a portable lantern that uses a 24 V power supply and draws a current of 0.80 A.
R = V/I
24 V/0.80 A = 30 Ω
Nuclear Energy
Two like charges ___ each other
Repel
The type of energy defined as the voltage difference in potential between two points in a circuit
Electrical Potential Energy
A circuit must be connected through all wires and components back to the source of electricity. This is known as a(n)
Closed Circuit
An electric space heater draws 30 A of current when plugged into a 120 V outlet. What is the power rating of the heater?
P = IV
(30 A)(120 V) = 3600 W
A form of energy from the vibration and movement of molecules is
Thermal (heat) energy
What is the electric charge of the electron?
Negative
The opposition presented to the current by a material or device is
Resistance
In what way are the lightbulbs A and B in Fig. 17.3 connected?
Series
The current in a resistor is 0.60 A when connected across a 120 V. What is the resistance of the resistor?
R = V/I
120 V/0.60 A = 200 Ω
What is the final form of energy conversion in this scenario:
Electrical energy in a light bulb turns into ______
Radiant Energy
Which one of the following materials is an electrical insulator?
wood, paper clip, air, steel nail
Wood
Predict which way a positive charge will move between two positions of different potential energy, one high and one low
From high to low
Electrical wires carry more than a safe level of current, and the circuit is said to be ___
Overloaded
A graphic calculator uses a 6.0 V battery and draws 0.003 A of current. What is the power of the circuit?
P = IV
(0.003 A)(6.0 V) = 0.018 W
Food before it is eaten is a source of this kind of energy
Chemical Energy
What missing electric charge would produce the electric field shown in Fig. 17.1?
Positive
A state of matter that has no electrical resistance is known as a
Superconductor
A switch that opens a circuit automatically when the current exceeds a certain value is known as a(n)
Circuit Breaker
The current in the heating element of an iron 5.0 A if the iron dissipates 550 W of power, what is the voltage across the iron?
V = P/I
550 W/5.0 A = 110 V