HW #4 Physics 100
A charging system producing 5 volts with 5 ohms resistor. The current in the circuit is _____________ Ampere.
1
The common C-cell is __________ volts.
1. 5
The common AA-cell is ________ volts.
1.5
A resistor has 8A of current flowing through it when directly connected to a 12 V power supply. What is its resistance value?
1.5 ohms
To say that an electrical device has 100 watts of power means that . . .
100 joules of electric potential energy are transferred each second
Three 300-ohm resistors in parallel give an equivalent resistance of
100 ohm
Three 300 ohm resistors in parallel give an equivalent resistance of
100 ohms
Two 200-ohm resistors in parallel give an equivalent resistance of
100 ohms
The current through a 10 ohm resistor connected to a 120 V power supply is
12 A
What is the electric potential difference across a 200 Ohm resistor that has 80mA of current flowing through it?
16 Volts
A 40 ohm resistor has a 4 A current in it. What is the voltage across the resistor?
160 V
A resistor has 12 A of current flowing through it when directly connected to a 24 V power supply. What is its resistance value?
2 ohms
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 10 ohm resistor has a 2 A current in it. What is the voltage across the resistor?
20 V
How much current flows through an 8.0 Ohm resistor when connected to a 24.0V power supply?
3.0 Amps
To say that an electrical device has a current of 300 Amps flowing through it means that
300 coulombs of charge enter and leave the device every second
To say that an electrical device has a current of 300 Amps flowing through it means that . . .
300 coulombs of charge enter and leave the device every second
Two 200-ohm resistors in series give an equivalent resistance of
400 ohms
A _________________ ohms size resistor would produce a 3 A current flow with a 15 V battery.
5
When a 10 V battery is connected to a resistor, the current through the resistor is 2 A. What is the resistor's value?
5 ohms
If 10 A current flows through 5 ohms resistance then the voltage drop in the circuit is ______________Volt.
50
A 10 ohm resistor has a 5 A current in it. What is the voltage across the resistor?
50 V
Three resistors, 1-ohm, 2-ohm, and 3-ohm are connected in series. Their equivalent resistance is
6 ohms
The current through a 10 ohm resistor connected to an 80 V power supply is
8 A
What is current measured in?
A (ampere)
True or false: in parallel circuit combination, if one bulb blew out, the other bulb would not be able to light up.
False
what equation would you use to solve for voltage?
V=I*R
When two cells are connected in parallel, they are connected
a. positive to positive b. negative to negative both
What happens when more bulbs are added in series combination?
all the bulbs get dimmer
In series circuit, if you unscrew one of the bulb from the bulb holder, what happens to all the other bulb?
all the other bulbs go out
The device that measure current in the circuit is called
ammeter
The combination of two or more chemical cells is called
battery
To complete a circuit, the switch must be
closed
Which of the following quantity remains same in series combination:
current
If the cross-sectional area of a wire is doubled, its resistance will be . . .
cut in half
If the resistivity of the metal used in making a wire is cut in half, the wire's resistance will be . . .
cut in half
As the number of resistors in a parallel circuit increase, the overall resistance ________________ and the current in the circuit ________________.
decreases, increases
The resistance of a piece of wire is _________________ proportional to its length and _________________ proportional to its cross-sectional area
directly; inversely
If the length of the wire is doubled, its resistance will be . . .
doubled
To say that an electrical battery has an electric potential difference of 200 volts means that . . .
each coulomb of charge gains 200 joules of electric potential energy
Chemicals cells convert chemical energy into
electrical energy
As the number of resistors in a series increases, the overall resistance _______________ and the current in the circuit _____________________
increases, decreases
To say that an electrical device has a resistance of 100-ohms means that . . .
it would take 100 volts to cause 1 amp of current through the device
To say that an electrical device has a resistance of 200-Ohms means that . . .
it would take 200 volts to cause 1 amp of current through the device
A 300-ohm resistor is connected in parallel with a 200-ohm resistor. We can say for certain that their total resistance is
less than 200 ohms
When two resistors are connected in parallel to a battery, the electrical resistance that the battery senses is
less than the resistance of either resistor
Coppor has the ___________ resistance to electron flow than aluminium
lower
When two resistors are connected in series to a battery, the electrical resistance that the battery senses is
more than the resistance of either resistro
In parallel circuit, if you unscrew one of the bulbs from the bulb holder, what happens to all the other bulbs?
nothing happens
What happens in a parallel circuit when more bulbs are added?
nothing happens
The SI unit of resistance is the
ohm
What is resistance measured in?
ohms
IF light bulbs is off, the circuit is
open
The house lights are connected in which of the following configuration?
parallel
According to Ohm's law, current equals the voltage divided by the
resistance
The Christmas lights are connected in which of the following configuration?
series
What is a resistance?
the ability to reduce the flow of electrons
Which of the following quantity remains same in parallel circuit:
voltage
The device that measures voltage is called
voltmeter
