Physics Current Electricity Level: High School
What is the current in the 5 ohm resistor in the circuit shown at “click here” ?
Physics Current Electricity Level: High School
Four 20 ohm resistors are connected in parallel and the combination is connected to a 20 V emf device . What is the current in the device ?
Physics Current Electricity Level: High School
A current of 0.3 A is passes through a lamp for 2 minutes using a 6 V power supply . What is the electrical energy dissipated by this lamp during the 2 minutes ?= 6 x 0.3 (2 x 60) = 216 J
Physics Current Electricity Level: High School
The mechanical equivalent of heat is 1cal = 4.18 J. A heating coil , connected to a 120 V source , provides 60000 calories in 10 minutes . What is the current in the coil ?
Physics Current Electricity Level: High School
Supposed the electrical company charges 10 cents per kWh. How much does it cost to use a 125W lamp 4 hours a day for 3 days ?
Physics Current Electricity Level: High School
A certain resistor dissipates electrical energy at a rate of 0.5 W when connected to a 3V potential difference . When connected to a 1V potential difference , the rate of electrical energy dissipates is ?
Physics Current Electricity Level: High School
A student kept her 60 watt , 120 volt study lamp turned on from 2 PM until 2 AM , What is the charge that went through it was ?
Physics Current Electricity Level: High School
A certain sample carries a current of 4A when the potential difference is 2V and a current of 10A when the potential difference is 4V . this sample has a resistance of 0.5 ohm at 1V. Please show the work .
Physics Current Electricity Level: High School
A nichrome wire is 1m long and 1 x 10^-6 m^2 in cross-sectional area . When connected to a potential difference of 2V , a current of 4A exists in the wire. What is the resistivity of this nichrome ?
Physics Current Electricity Level: High School
A 10 ohm resistor has a constant current . If 1200 C of charge flow through it in 4 minutes what is the value of the current ?
Physics Current Electricity Level: High School
10.0 m wire consists of 5.0 m of copper followed by 5.0 m of aluminum of equal diameter (both 1.0 mm) . A voltage difference of 80V is placed across the composite wire .(a) What is the total resistance of the wire ?
(b) What is the current flow through the wire ?
(b) What is the voltage across the aluminum part and across the copper part ?
Physics Current Electricity Level: High School
A rectangular solid made of carbon has sides lying along the x,y and z axes. Whose lengths are 1.0 cm. 2.0 cm. and 4.0 cm , respectively (see the figre at “click here”) . Determine the resistance for current that flows through the solid in(a) the x direction,
(b) the y direction
(c) the z direction
Assume the resistivity is p = 3.0 x 10^-5 ohm.m.
Physics Current Electricity Level: High School
A 100-W light bulb has a resistance of about 12 ohm When cold ( 20 degreeC) and 140 ohm when on (hot) . Estimate the temperature of the filament when”on “ assuming an average temperature coefficient of resistivity ‘infinite’ = 0.0060 (Cdegree)^-1 .
Physics Current Electricity Level: High School
Estimate at what temperature copper will have the same resistivity as tungsten does at 20 degreeC ?
Physics Current Electricity Level: High School
A length of aluminum wire is connected to a precision 10.00 V power supply , and a current of 0.4212 A is precisely measured at 20.0 degreeC. The wire is placed in a new environment of unknown temperature where the measured current is 0.3618A . What is the unknown temperature ?