Physics Current Electricity Level: High School
Using the figure at ‘click here’ finda) the current through each capacitor.
b) the voltage drop across each resistor.
Physics Current Electricity Level: High School
Two scales on a voltmeter measure voltage up to 20.0 and 30.0 V , respectively . The resistance connected in a series with the galvanometer is 1680 Ohm for the 20 V scale , and 2930 Ohm for the 30 V scale . Determine the coil resistance and the full scale current of the galvanometer that is used in the voltmeter .
Physics Current Electricity Level: High School
Two resistances , R1 and R2 , are connected in series across a 12V battery . The current increases by .20 A when R2 is removed , leaving R1 connected across the battery . However , the current increases by just . 10A when R1 is removed , leaving R2 connected across the battery . Finda) R1
b) R2
Physics Current Electricity Level: High School
A piece of nichrome wire has a radius 6.5 x 10-4 m . It is used in the laboratory to make a heater that dissipates 4.00 x 102 W of power when connected to a voltage source of 120 V . Ignoring the effect of temperature on resistance , estimate the necessary length of wire .
Physics Current Electricity Level: High School
Chemical effect
One way to measure the mass of silver atoms is by electroplating . The following data are taken for an experiment .Current = 0.45 A
Time of flow = 50 minutes
Mass plated out = 1.48 grams
From the data above find the mass of a silver atom .
Physics Current Electricity Level: High School
Chemical effect
The quantity of charge 96,485 C is called the faraday . How many singly charged ions must plate out at an electrode to deposit one faraday of charge ?
Physics Current Electricity Level: High School
A certain new 12 V car battery has an internal resistance of 0.0095 ohms . On a cold day , the starter of the car uses a current of 130 Aa) By how much does the terminal p.d of the battery decrease when the starter is used ?
b) The cable connecting the starter to the battery has a resistance of 1.2 x 10 to the negative 3rd ohms . How many calories of heat are developed in it during the 5.0 s that the starter is on ?
Physics Current Electricity Level: High School
How many 75 W /120 V bulbs can be operated on a 20 A house circuit ? Suppose that a 1200 W iron is operating at the same time . How many 75 W bulbs can then be used ?
Physics Current Electricity Level: High School
The following are operating from a 120 V house line : a 60 W bulb , a 1200 W toaster , and a 100 W bulb .a) How much current is being drawn by the toaster ?
b) How much current is passing through the fuse for this line ?
Physics Current Electricity Level: High School
The following are connected in a series circuit : 6.0 V battery , 9.0 V battery , 45 ohm resistor . Use the loop rule to find the current if the batteries area) aiding
b) opposing
Physics Current Electricity Level: High School
How much power is lost in a 7 ohm resistor when a current of 3.0 A flows through it ?
Physics Current Electricity Level: High School
You are given two resistors . One is 3.0 ohms and the other is 5.0 ohms . By using them in different ways. You can obtain four different equivalent resistances . What are they ?
Physics Current Electricity Level: High School
A certain ammeter has a resistance of 0.0020 ohms . By mistakes a student connects it directly across a 1.50 V dry cell . (He though it was a volt meter and was using it to measure the cell voltage ) How much current flows through the meter before it burns out ? ( In a case like this the wires inside the meter would becomes so hot they would melt )
Physics Current Electricity Level: High School
A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps . What is the maximum number of light bulbs which can be lit simultaneously in parallel in this circuit without blowinga) 4
b) 18
c) 20
d) 24
Physics Current Electricity Level: High School
The resistance of a 25 watt bulb is _______ that of a 100 watt bulb , if both ran on the same voltagea) one half
b) four times
c) double
