Physics Current Electricity Level: High School
Four 20-Ohm resistor are connected in parallel and the combination is connected to a 20-V emf device . The current in anyone of the resistor is :a) 0.25 A
b) 1.0 A
c) 4.0 A
d) 5.0 A
e) 100 A
Physics Current Electricity Level: High School
By using only two resistors, R1 and R2 , a student is able to obtain resistance of 3 Ohm , 4 Ohm , 12 Ohm , and 16 ohm using them alone or in combination . The value of R1 and R2 (in Ohms) are ?a) 3,4
b) 2,12
c) 3,16
d) 4,12
e) 4,16
Physics Current Electricity Level: High School
A total resistance of 3.0 Ohm is to be produced by combining an unknown resistor R with a 12 Ohm resistor . What is the value of R and how is to be connected to the 12 Ohm resistor ?a) 4.0 Ohm, parallel
b) 4.0 Ohm, series
c) 2.4 Ohm, parallel
d) 2.4 Ohm, series
e) 9.0 Ohm, series
Physics Current Electricity Level: High School
Kirchoff's Law
Four wires meet at a junction . The first carries 4 A into the junction, the second carries 5 A out of the junction , and the third carries 2 A out of the junction , the fourth carries ?a) 7 A out of the junction
b) 7 A into the junction
c) 3 A out of the junction.
d) 3 A into the junction.
e) 1 A into the junction.
Physics Current Electricity Level: High School
The emf of a battery is equal to its terminal potential difference of ?a) Under all conditions
b) Only when the battery is being charged .
c) Only when a large current is in the battery .
d) Only when there is no current in the battery .
e) Under no conditions .
Physics Current Electricity Level: High School
Kirchoff's Law
“ The sum of the emf’s and potential differences around a closed loop equals zero” is a consequence of ?a) Newton’s third law.
b) Ohm’s law.
c) Newton’s second law.
d) Conservation of energy.
e) Conservation of charges.
Physics Current Electricity Level: High School
In the contest of the loop and junction ruled for electrical circuits a junction isa) Where a wire is connected to a resistor .
b) Where a wire is connected to a battery .
c) Where were only two wires are joined .
d) Where three or more wires are joined .
e) where a wire is bent .
Physics Current Electricity Level: High School
Current flows out of a 110 V source through a 10 ohm resistor and then through 11 branches , one containing a 20 ohm and the other a 30 ohm resistor .a) Draw a large , labelled diagram .
b) Create a table showing the V, I, R and P for each resistor and the circuit total .
c) Compete the table .
Physics Current Electricity Level: High School
At 20 degrees celcius , the carbon resistor in an electric circuit connected to a 50.0 V battery has a resistance of 200 ohms . what is the current in the circuit when the temperature of the carbon rises to 80 degrees celcius ?
Physics Current Electricity Level: High School
Three resistors of 4.0 , 6.0 and 10.0 ohms are connected in parallel . If the combination is connected in series with a 12.0 V battery and a 2.0 Ohm resistor , What is the current through the 10.0-Ohm resistor ?
Physics Current Electricity Level: High School
A non-ideal battery has a 6.0 V emf and an internal resistance of 0.6 ohm . Determine the terminal voltage when the current drawn from the battery is 1.0 A .a) 5.0 V
b) 6.0 V
c) 5.4 V
d) 6.66 V
e) 5.8 V
Physics Current Electricity Level: High School
Some light bulbs are connected in parallel to a 120 V source as shown in the figure at “click here” . Each bulb dissipates an average power of 60 W. The circuit has a fuse F that burns out when the current in the circuit exceeds 9A . Determine the largest number of bulbs ,which can be used in the circuit without burning out the fuse .a) 9
b) 17
c) 25
d) 34
e) 36
Physics Current Electricity Level: High School
Which one of the following statements concerning superconductors is false ?a) Below is critical temperature, the resistivity of a superconductor is zero ohm-m
b) Critical temperatures for some superconductors exceed 100 K .
c) All materials are superconducting at temperatures near absolute zero Kelvin .
d) A constant current can be maintained in a superconducting ring for several years without an emf .
e) Superconductors are perfect conductors .
Physics Current Electricity Level: High School
How many electrons flow through a battery that delivers a current of 3.0 A for 12 s ?a) 4
b) 36
c) 4.8 x 10^15
d) 6.4 x 10^18
e) 2.2 x 10^20
Physics Current Electricity Level: High School
Find the current in each resistor in the figure at ‘click here’