Physics Current Electricity Level: High School
Three resistors connected in parallel have individual values of 4.0 , 6.0 and 10.0 ohm respectively . If this combination is connected in series with a 12-V battery and a 2.0 ohm resistor , what is the current in the 10 ohm resistor ?a. 0.59 A
b. 1.0 A
c. 11 A
d. 16 A
Physics Current Electricity Level: High School
As shown in the figure at “click here’ which resistor is in series with resistor R ?a. R1
b. R2
c. R3
d.R4
Physics Current Electricity Level: High School
When a 24.0 ohm resistor is connected across a 12.0 V battery , a currenof 482 mA flows . What is the resulting terminal voltage of the battery ?a. 0.4 V
b. 5.8 V
c. 11.6 V
d. 12.0 V
Physics Current Electricity Level: High School
The two ends of a 3.0 ohm resistor are connected to a 9.0V battery . What is the total power delivered by the battery to the circuit ?a. 3.0 W
b. 27 W
c. 0.33 W
d. 0.11 W
Physics Current Electricity Level: High School
An 8.00 ohm resistor is dissipating 100 watts . What are the current through it , and the difference of potential across it ?a. 12.5 A, 28.3 V
b. 3.54 A, 12.5 V
c. 3.54 A, 28.36V
d. 28.3 A, 3.54 V
Physics Current Electricity Level: High School
The heating coil of a water heater has a resistance of 20 ohm and operate sat 210 V . How long a time is required to raise the temperature of 200 kg of water from 15 degreeC to 80 degreeC ? ( The specific heat for water = 103 cal/kg. degreeC and 1.0 cal = 4.186 J .)a. 1.7 h
b. 3.8 h
c. 5.1 h
d. 6.9 h
Physics Current Electricity Level: High School
A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator which converts 95% of this mechanical energy into electrical energy . What is the current delivered by the generator if it delivers at 3600 Va. 0.66 x 103 A
b. 1.0 x 103 A
c. 1.2 x 103 A
d. 5.9 x 103 A
Physics Current Electricity Level: High School
The temperature coefficient of resistivity for a “perfect” ohmic material would be .a. positive and constant.
b. zero .
c. negative .
d. positive and uniformly increasing .
Physics Current Electricity Level: High School
A tungsten wire is used to determine the melting point of indium . The resistance of the tungsten wire is 3.000 ohm at 20 dgreeC and increases to 4.850 ohm as the indium starts to melt tungsten = 4.50 x 10- 3 (degreeC) -1. What s the melting temperature of indium ?a. 132 degreeC
b. 157 degreeC
c. 351 degreeC
d. 731 degreeC
Physics Current Electricity Level: High School
A metal wire has a resistance of 25.00 ohm . Under room temperature conditions of 25 degreeC when the wire is heated to 85 degreeC the resistance increases by 0.75 ohm . What is the temperature coefficient of resistivity of this metal ?a. 5.0 x 10-4(degreeC)-1
b. 1.3 x 10-3(degreeC)-1
c. 1.5 x 10-3(degreeC)-1
d. 2.5 x 10-3(degreeC)-1
Physics Current Electricity Level: High School
Number 10 copper wire (radius = 1.3mm) is commoly used for electrical installation in homes .What is the voltage drop in 40 m of #10 copper wire if it carries a current of 10A? (The resistivity of copper is 1.7 x 10-8 ohm.m .)a. 1.3 V
b. 0.77 V
c. 0.50 V
d. 0.13 V
Physics Current Electricity Level: High School
A flashlight bulb operating at a voltage of 4.5 V has a resistance of 8.0 ohm . How many electrons pass through the bulb filament per second (e = 1.6 x 10-19 C) ?a. 3.7 x 1016
b. 1.8x 1021
c. 9.4 x 1017
d. 3.5 x 1018
Physics Current Electricity Level: High School
A high voltage transmission line of diameter 2 cm and length 200 km carries a steady current of 1000A . If the conductor is copper with a free charge density of 8 x 1028 electrons/m3 , how long does it take one electron to travel the full length of the cable ? (e = 1.6 x 10-19 C)a. 8 x 102 s
b. 8 x 104 s
c. 8 x 106 s
d. 8 x 108 s
Physics Current Electricity Level: High School
When an electric current exist s within a conducting wire , which of the following statement describes the condition of any accompanying electric field ?a. must be zero .
b. must be parallel to current flow .
c. Must be anti-parallel (opposite direction) to current flow .
d. must be perpendicular to current flow .
must be parallel to current flow .
Physics Current Electricity Level: High School
If a metallic wire of cross sectional area 3.0 x 10-6 m2 carries a current of 6.0 A and has a mobile charge density of 4.24 x 1028 carriers/m3 , What is the average drift velocity of the mobile charge carriers ? (charge value = 1.6 x 10-19 C)a. 3.4 x 103 m/s
b. 1.7 x 103 m/s
c. 1.5 x 10-4 m/s
d. 2.9 x 10-4 m/s
