Phys 1415 ch 8
A pair of 1 ohm resistors connected in parallel has a combined resistance of
1/2 ohm
A power line with a resistance of 2 ohms draws a current of 80A the power dissipated in the line is
12800 W
The current through a 10 ohm resistor connected to a 120V power supply is
12A
The amount of energy given to each coulomb of charge flowing through a 12V battery is
12J
Two charges separated by 1m exert a 1.0N force on each other if the charges are pushed to .25m separation the force on each charge will be
16N
An electron is pushed into an electric field where it acquires a 1V electric potential. If two electrons are pushed the same distance into the same electric field the electric potential of both electrons is
1V
When a battery does 24J of work on 10C of charge he voltage it supplies is
2.4V
The current through two identical light bulbs connected in series is .25A the voltage across both bulbs is 110V. The resistance of a single light bulb is
220 ohms
In a simple circuit consisting of a single lamp and a single battery when the current in the lamp is 2A the current in the battery is
2A
The electric force on a 2C charge is 60N how great is the electric field at the charge location
30N/C
What is the power rating of a lamp connected to a 12V source when it carries 2.5A
30W
When a pair of charged particles are bought twice as close to each other the force between them becomes
4 times as strong
Two charges separated by 1 m exert a 1N force on each other if the magnitude of each charge is doubled the force on each charge will be
4N
An electric heater is rated at 300 W when used in a 110v circuit the safety fuse in the circuit can accommodate 15A of current how many heaters can be safely operated in the circuit
5
A resistor carries a current of 2A when connected to a 10V battery what is the resistors value?
5 ohms
A coulomb of charge passing through a 6V battery supplies
6J
Electric charge will flow in an electric circuit when
A potential difference exists
An electric field surrounds all
All of the above
The source of electrons lighting an incandescent ac light bulb is
Atoms in the light bulb filament
An electron and a proton
Attract each other
To say that electric charge is conserved is to say that electric charge
Can neither be created nor destroyed
The electric field in the wires of an ac circuit
Changes direction with time
Which statement is correct
Charge flows in a circuit
When you double the voltage in a simple electric circuit you double the
Current
The fundemental force underlyingnall chemical reactions is
Electrical
When we say an appliance uses up electricity we actually are saying that
Electrical energy changes to thermal energy
The electric current in a copper wire is normally composed of
Electrons
The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is
Electrons already in the filament
The number of protons in the nucleus of an electrically neutral atom is equal to the number of
Electrons that surround the nucleus
Just as water flows from high to low pressures electric charges flows from
High to low voltage
Heat a copper wire and its electric resistance
Increase
To say that a object is electrically polarized is to say
It's charges have been rearranged
Electric potential energy is measured in units of
Joules
Compared to a single lamp connected to a battery two identical lamps connected in series to the same battery will draw
Less current
A compact fluorescent lamp gives more light output for
Less power
When two lamps are connected in parallel to a battery the electric resistance that the battery senses is
Less than the resistance of either lamp
Which is more dangerous touching a faulty 120V light fixture or a Van de Graaff generator charged to 100000V
Light fixture
In a circuit with two lamps in parallel if the current in one lamp is 2A the current in the battery is
More than 2A
When you scuff electrons from a carpet onto your feet you become
Negatively charged
Electric potential and electric potential energy are
Neither of these
When we say charge is conserved we mean that change can
Not be created or destroyed
A water molecule is electrically
Polarized
The direction of an electric field is defined as the direction of force on a
Positively charged particle
The purpose of a voltage source is to provide an electrical
Pressure
When the distance between two charges is halved the electric force between the charges
Quadrupled
If you double both the current and the voltage in a circuit the power
Quadruples
A difference between electric and gravitational forces is that electric forces include
Repulsive interactions
Two lamps one with a thick filament and one with a thin filament are connected in parallel. The current is greater in the lamp with the
Thick filament
Compared to the mass of a proton the mass of the electron is
Very much less
The electric resistance of a superconductor is
Zero