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 Electrostatics Level: High School
A 15 micro F capacitor is connected to a 50-V battery and becomes fully charged . The battery is removed and a slab of dielectric that completely fills the space between the plates is inserted. If the dielectric has a dielectric constant of 5.0, what is the voltage across the capacitor’s plates after the slab is inserted ?
Physics Electrostatics Level: High School
Two parallel plates, separated by 0.20 m are connected to a 12-V battery . An electron is released from rest at a location 0.10 m from the negative plate . When the electron arrives at a distance 0.05 m from the positive plate , what is the speed of the electron ?
Physics Electrostatics Level: High School
A point charge of +Q is placed at the center of an equilateral triangle . When a second charge of +Q is placed at one of the triangle’s vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices ?
Physics Electrostatics Level: High School
The battery has a potential difference of V = 10.0 V and the five capacitors each have a capacitance of 10.4 micro F. What is the charge in microcoulombs on (a) capacitor 1 and (b) capacitor 2 ?
Physics Electrostatics Level: High School
Find the equivalent capacitance of the combination in the circuit as shown in the figure at ‘click here’ . Assume that C1 = 10.5 microF, C2 = 5.44 micro F, and C3 = 5.91 micro F .
Physics Electrostatics Level: High School
What capacitance is required to store an energy of 11 kW-h at a potential difference of 1200 V ?