A standard 100 W (120 V) lightbulb contains a 7.0-cm-long tungsten filament. The high- temperature resistivity of tungsten is 9.0 × 10-7 Ω m. Part A What is the diameter of the filament? Express your answer with the appropriate units. d = PH HÅ Submit Value Request Answer Units ?

Consider a 120-V electrical line in a home that is connected to a 40.0-W lightbulb, a 180-W television set, a 240-W desktop computer, a 1050- W toaster, and a 240-W refrigerator. Part A Calculate the current flowing in the line? Express your answer with the appropriate units. I = Value Units Submit Request Answer

a. A heater consists of a variable resistor connected across an ideal voltage supply (no internal resistance). To increase the heat output, should you decrease the resistance or increase the resistance? Explain your answer.

IP Three resistors, R₁ = 30, R2 = 68 2, and R3 = R, are connected in parallel with a 12 V battery. Part A The total current flowing through the battery is 0.88 A. Find the value of resistance R. Express your answer using two significant figures. R= Submit Part B I1, I2, I3 = | ΑΣΦ Submit 3 Request Answer Find the current through each resistor. Enter your answers numerically separated by commas. Express your answers using two significant figures. [ΨΕΙ ΑΣΦ ? Request Answer Ω ? A

Part A A 5.1x10 V/m electric field creates a 3.5x1017 electrons/s current in a 2.0-mm-diameter aluminum wire. What is the drift speed? Express your answer using two significant figures. m/s = Pa Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B What is the mean time between collisions for electrons in this wire? Express your answer using two significant figures.

Some human nerve cells have a long, thin cylindrical cable (the axon) from their inputs to their outputs. Consider an axon of radius -6 4.9 x 10⁰ m and length 0.55 m. The resistivity of the fluid inside the axon is 0.50 2. m. Part A Determine the resistance of the fluid in this axon. Express your answer with the appropriate units.

A battery has emf 26.0 V and internal resistance r. A 9.00 N resistor is connected to the terminals of the battery, and the voltage drop across the resistor is 24.0 V Part A What is the internal resistance of the battery? Express your answer with the appropriate units. HA ? Value Units Submit Request Answer

In an integrated circuit, the current density in a 2.3-um-thick x 75-um-wide gold film is 7.0x105 A/m² Part A How much charge flows through the film in 15 min? Express your answer to two significant figures and include the appropriate units. Q = μA Value Submit Request Answer Units ?

Part A What is the resistance of A 1.0-m-long gold wire that is 0.50 mm in diameter? Express your answer in ohms. ? R = Ω Submit Request Answer Part B A 10-cm-long piece of carbon with a 1.4 mm x 1.4 mm square cross section? Express your answer in ohms. ? R = Submit Request Answer

An ammeter whose internal resistance is 60 2 reads 5.43 mA when connected in a circuit containing a battery and two resistors in series whose values are 500 n and 450 2. Part A What is the actual current when the ammeter is absent? Express your answer using two significant figures. I = A