HW Chapter 6 Part 1 Physics
The current in a 100-W bulb connected to a 120-V source is
0.833
The current through a 10 ohm resistor connected to a 120-V power supply is
12 A
Two charges separated by one meter exert a 1-N force on each other. If the charges are pushed to 0.25-m separation, the force on each charge will be
16 N
When a pair of 1 ohm resistors are connected in series, their combined resistance is
2 ohms, and when in parallel, 1/2 ohm.
A 4 ohm resistor is connected in parallel with a 6 ohm resistor. This combination produces an equivalent resistance of
2.4 ohms
The electric power of a lamp that carries 2 A at 120 V is
240 W
The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located?
30 N/C
The power dissipated in a 4 ohm resistor carrying 3 A is
36 W
When a 10-V battery is connected to a resistor, 2 A of current flow in the resistor. What is the resistor's value?
5 ohms
The electrical force between charges is strongest when the charges are
Close together
Which statement is correct? Select one: A.Current flows through a circuit B.Voltage flows through a circuit. C.Resistance is established across a circuit. D.Current causes voltage.
Current flows through a circuit.
The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then
Zero
Electrons are made to flow in a wire when there is
a potential difference across its ends
To say that electric charge is conserved is to say that electric charge
can neither be created nor destroyed.
An ampere is a unit of electrical
current
Every proton in the universe is surrounded by its own
electric field and gravitational field
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
Heat a copper wire and its electric resistance
increases
Stretch a copper wire so that it is thinner and the resistance between its ends
increases
To say that an object is electrically polarized is to say
its charges have been rearranged.
When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is
less than 1 cm/s.
Charge carriers in a metal are electrons rather than protons because electrons are
loosely bound
The electrical forces between charges depends on the
magnitude of electric charges and separation distance between electric charges.
A positive ion has more
protons than electrons
A main difference between gravitational and electric forces is that electrical forces
repel or attract.
The source of electrons in an ordinary electrical circuit is
the electrical conductor itself
A woman experiences an electrical shock. The electrons making the shock come from the
woman's body