Physics Current Electricity Level: High School
Two identical light bulbs are placed any-where in any circuit . Let the current through #1 be i1 and the power consumed by #1 be P1, and the corresponding quantities i2 and P2 for bulb #2 . If the ratio P1/P2 = 2 , the ratio i1/i2 will be given by ?(i) i1/i2 = 1/6
(ii) i1/i2 = 2
(iii) Not enough information
(iv) i1/i2 = square root 2 .
Physics Current Electricity Level: High School
Find the ratio V’1/V’2 of the voltage drop .(i) V’1/V’2 = 5/3
(ii) V’1/V’2 = 2
(iii) V’1/V’2 = 2/3
(iv) V’1/V’2 = 1/7
Physics Current Electricity Level: High School
Find the ratio (P’2 + P’3) / P’1 , where P’1 is the power dissipated in the ith resistor .(i) (P’2 + P’3) / P’1 = 2
(ii) (P’2 + P’3) / P’1 = 1/3
(iii) (P’2 + P’3) / P’1 = 1/2
(iv) (P’2 + P’3) / P’1 = 5/3
Physics Current Electricity Level: High School
Consider a circuit with three identical bulbs , an ideal battery , and a switch S . Assume the resistance of each light bulb remains constant . Leaving S open,(a) compare i0, i1 and i2 .
(i) i0 < i2 < i1
(ii) i1 > i0 = i2
(iii) i0 = i1 = i2
(b) Now we close S . Denote the open switch circuit quantities as unprimed , and the closed switch circuit quantities as primed . Determine i’1/i1.
(i) i’1/i1 = 2
(ii) i’1/i1 = 5/3
(iii)i’1/i1 = 4/3
(iv)i’1/i1 = 1/3
(c) Determine i’2/i2
(i) i’2/i2 = 1/ 2
(ii) i’2/i2 = 1
(iii) i’2/i2 = 5/3
(iv) i’2/i2 = 1/6
Physics Current Electricity Level: High School
Ohm’s Law
Consider the circuit in the figure .a) Find the potential difference across the 2.0 Ohm resistor . Answer in units of V .
b) Find the potential difference across the 3.0 Ohm resistor . Answer in units of V .
c) Find the potential difference across the 9.0 Ohm resistor . Answer in units of V .
d) Find the potential difference across the 2.0 Ohm resistor . Answer in units of V .
Physics Current Electricity Level: High School
A 29 V battery has an internal resistance r . What is the value of r ? Answer in units of Ohm .Determine the magnitude of the current through the 90 Ohm resistor on the right-hand side of the circuit . Answer in units of A .
Physics Current Electricity Level: High School
A 20 V battery delivers 107 mA of current when connected to a 73 Ohm resistor . Determine the internal resistance of the battery . Answer in units of Ohm .
Physics Current Electricity Level: High School
Electric Power
A lamp draws 0.867 A from a 113 V generator . How much power does the generator deliver ? Answer in units of W .(a) How much energy does the lamp convert in 8.4 min ? Answer in units of J .
Physics Current Electricity Level: High School
Following is a details of an electric bill .In 65 days you used 514 kWh
Read date Meter # 0079051
01.21.00 60634
12.19.99 60120
Difference 514
Rate calculation :
Residential service Rate , Multi-fuel
Customer charge : $6.00
Energy: 514 kWh at $.03550 /kWh 18.25
Fuel : 514 kWh at $.01467/kWh 7.54
Subtotal electric charges $31.79
Sales Tax 0.30
Total cost for electric service $32.09
For this 65 days period , your average daily cost for Electric service was $0.49(a) How much energy was consumed in this billing cycle ? Answer in units of J .
(b) What is the average energy consumed per day in kilowatt-hour ? Answer in units of kWh/day .
(c) What is the average energy consumed per day in Joules ? Answer in units of J/day .
(d) If the cost of energy were increased to $0.24 /kWh , how much more would energy cost in this billing cycle ? (Assume that the price of fuel remains constant. )
Physics Current Electricity Level: High School
When switch S is open , the ammeter in the circuit shown reads 2.0 A . when S is closed , the ammeter reading :a) Increases slightly .
b) Remains the same .
c) Decreases slightly .
d) Double .
e) Halves .
Physics Current Electricity Level: High School
In the diagrams which is shown at “click here” all light bulbs are identical and all emf devices are identical . In which circuit (A,B,C,D,E) will the bulbs be dimmest ?
Physics Current Electricity Level: High School
In the diagrams which is shown at “click here” , all light bulbs are identical and all emf devices are identical. In which circuit (A , B , C, D, E ) will the bulbs glow with the same brightness as in circuit X ?
Physics Current Electricity Level: High School
In the diagram which is shown at “click here” R1>R2>R3 . Rank the three resistors according to the current in them , least to greatest .a) 1, 2, 3
b) 3, 2, 1
c) 1, 3, 2
d) 3, 1, 3
e) All are the same .
Physics Current Electricity Level: High School
A battery with an emf of 24 V is connected to a 6-Ohm resistor . As a result , current of 3 A exists in the resistor . The terminal potential difference of the battery is :a) 0
b) 6 V
c) 12 V
d) 18 V
e) 24 V
Physics Current Electricity Level: High School
Four 20-Ohm resistor are connected in series 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
