Electric Circuits Physics
If 5 C of charge flow past point A in 10 seconds, then the current is _____ A.
0.5
A current of one ampere is a flow of charge at the rate of ____ coloumb per second
1
Role of a battery in a electrical circuit = 3 different ways
1. Energy Supply 2. Energy supplied by the work to do work upon the charge to move it against the electric field from the negative terminal to the positive terminal. 3. By moving the charge against the field from negative to positive terminal, the battery establishes an electric potential difference across the two ends of the external circuit.
An electric device with a resistance of 3 Ohms has an electric potential difference of _______ V impressed across it; the current in the device is 4 amperes.
12
If 12 C of charge flow past point A in 3 seconds, then 8 C of charge will flow past point E in ____ seconds.
2
A circuit is set up with a current of 8 Amps. What would be the new current if the resistance is increased by a factor of 2 and the battery voltage is decreased by a factor of 2?
2 A
A circuit is set up with a current of 8 Amps. What would be the new current if the resistance is increased by a factor of 4?
2 A
An electric device with a resistance of _____ Ohms has an electric potential difference of 120 V impressed across it; the current in the device is 6 amperes.
20
If the current at point D is 2.0 A, then _____ C of charge flow past point D in 10 seconds.
20
A circuit is set up with a current of 8 Amps. What would be the new current if the battery voltage is increased by a factor of 3?
24 A
A circuit is set up with a current of 8 Amps. What would be the new current if the resistance is decreased by a factor of 3?
24 A
An electric device with a resistance of 2 Ohms has an electric potential difference of 6 V impressed across it; the current in the device is _______ amperes.
3
When a charge of 8 C flows past any point along a circuit in 2 seconds, the current is _____ A.
4
A circuit is set up with a current of 8 Amps. What would be the new current if the battery voltage is decreased by a factor of 2?
4 A
A circuit is set up with a current of 8 Amps. What would be the new current if the resistance is increased by a factor of 2?
4 A
A circuit is set up with a current of 8 Amps. What would be the new current if the resistance is decreased by a factor of 4 an the battery voltage is increased by a factor of 3?
96 A
The cause of resistance to the flow of charge within an electrical wire is _______. a) mobile charge carriers collide with atoms of the resistor b) mobile charge carriers have mass (possess inertia) which resists their motion c) the electric field that causes charge flow diminishes with distance d) charge is consumed or used up as it flows through the wire
A
The rate at which charge flows through a circuit is _________________________ to the resistance. a) inversely related b) directly related c) not related
A
Resistance
A measure of the amount of hindrance to the flow of charge
The current will be Greatest in a circuit in
A wire that has a low resistance, a short length, a wide width, any 12-gauge wires (1/12th inch diameter) and with silver wiring.
Resistance to charge flow will be greatest in
A wire which is thin, long, made of plastic or copper.
Gains and losses in electric potential are often represented using
An electric potential diagram
To maintain a charge flow in an electric circuit,
An external energy supply is needed, along with a closed conducting loop between the positive and negative terminal
The electric potential difference is simply the
Battery voltage
As a quantity, electric current is defined as the__________. a) amount of charge present in a circuit b) potential energy per charge c) rate at which charge moves through a corss-sectional area of a wire d) speed at which charge moves from one location to another location
C
A current is said to exist whenever___________. a) a wire is charged b) a battery is present c) electric charges are unbalanced d) electric charges move in a loop
D
When a positive test charge naturally moves from one location to another without the exertion of a non-conservative force, potential energy _______ and electric potential _________. (increases/decreases)
Decreases, Decreases.
Resistance is quantifiable - that is, it can be measured and calculated. The standard metric unit used to express the amount of electrical resistance is the _____. a) Joule b) Watt c) Volt d) Amp e) Ohm
E
When you turn on the room lights, they light immediately. This is best explained by the fact that
Electrons present everywhere in the circuit move instantly
Potential energy
Energy stored in an object due to its position
When a battery no longer works, it is out of charge and must be re-charged before it can be used again
False
As a positive charge moves through the battery from the negative terminal to the positive terminal, it ________ potential energy and ___________ electric potential. (gains/loses) The point of highest energy within a battery is the ______ (+/-) terminal.
Gains, Gains, +.
Charge will only flow through a wire (if)
If there is an electric potential difference across its ends
As the battery voltage is increased by swapping in higher voltage batteries, the current is ______________ (increased, decreased).
Increased
When work is done on a positive test charge to move it from one location to another, potential energy __________ and electric potential ________. (increases/decreases)
Increases, Increases.
As a positive charge moves through the external circuit from the positive terminal to the negative terminal, it ________ potential energy and ________ electric potential. (gains/loses) The point of highest energy within the external circuit is closest to the _____ (+/-) terminal.
Loses, Loses, +.
Arrows facing right, point B is on the right, point A with the test charge is on the left. What is the work done on test charge? Where is the potential energy and electric potential greatest at?
No, A.
Arrows facing up, point B is on top and point A is on the bottom with the test charge. What is the work done on test charge? Where is the potential energy and electric potential greatest at?
No, A.
Direction of the Electric Field Vector
The direction that a positive test charge would be accelerated
When the loop is connected between the positive and negative terminal,
The requirements are met and the charge will flow
The amount of potential difference (ΔV) between two locations is related to
The work done in moving an amount of charge from the low potential to the high potential location
Current is also affected by the electric potential difference impressed across its ends. (True or False)
True
Resistance is not the only variable that affects the current in an electric circuit (True or False)
True
The current is the same at all locations within an electric circuit (T or F)
True
How fast does charge move through an electric circuit?
Very very slowly
Arrows facing right, point A with the test charge is on the right, point B is on the left. What is the work done on test charge? Where is the potential energy and electric potential greatest at?
Yes, B.
Arrows facing up, point A is on top with the test charge and point B is on the bottom. What is the work done on test charge? Where is the potential energy and electric potential greatest at?
Yes, B.
As charge moves through an electric circuit,
charge is re-energized and recycled
The electric potential that is gained by the charge when it passes through the battery
is lost by the charge as it moves through the external circuit
When there is an electric potential between two locations,
the charge will move from the location of high potential to the location of low potential
Without a potential difference between two locations,
the charge will not move
Electric Field
the space around a charged object in which another charged object experiences an electric force
Once at the positive terminal, the charge spontatneously moves
through the external circuit, losing energy as it passes through each electrical device
In a battery, energy is supplied to the charge
to move it from low potential to high potential
