watt/volt = coulomb/second ampere. A 1500-W heater is designed to be plugged into a 120-V outlet. Part B What is R, the resistance of the heater? Express your answer numerically in ohm using three significant figures. • View Available Hint(s) ? R = 國
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- A potential difference, V, is applied across the length of a conducting wire with resistivity, p, radius, r, and length, L. (a) Write symbolic expressions for the following in terms of V, p, r, and L (ONLY and as needed), along with any constants. • Electric Field Strength: E = • Resistance: R = • Current: I = • Current Density: J = (b) Combine the equations above to obtain symbolic expressions for the current and current density in terms of V, E, R, and p (ONLY and as needed). Don't look it up! See how it all fits together! || • J=+ How a Real Voltmeter Works 4 of 20 I Review | Constants Part A Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large. A voltmeter with resistance Ry is connected across the terminals of a battery of emf E and internal resistance r. Find the potential difference Vmeter measured by the voltmeter. • View Available Hint(s) ? Vmeter = Submit Previous Answers Part B Complete previous part(s) Next > Provide FeedbackPart A How many kWh of energy does a 650-W toaster use in the morning if it is in operation for a total of 5.5 min ? Express your answer to two significant figures and include the appropriate units. Energy = 6.0x10-2 kWh Submit Previous Answers Correct Part B At a cost of 9.0 cents/kWh, estimate how much this would add to your monthly electric energy bill if you made toast four mornings per week (16 times per month). Express your answer using two significant figures. ? Cost = cents/month
- When an ammeter is used to measure the current is in the circuit shown in (Figure 1 ), it reads 6 A. Part A What is the resistance of the ammeter if v₂ = 27 V? Express your answer to three significant figures and include the appropriate units. ▸ View Available Hint(s) Figure 2.516 Us is 4.80 16 1 of 1 με ? Rmeter 4.5 Ω Submit Previous Answers × Incorrect; Try Again; 2 attempts remaining Part B What is the percentage of error in the current measurement? Express your answer as a percentage to three significant figures. ▸ View Available Hint(s) % error = 40 ΜΕ ΑΣΦ Η vec Submit Previous Answers × Incorrect; Try Again; 5 attempts remaining < Return to Assignment Provide Feedback ? %Part A A wire of length L and cross-sectional area A has resistance R What will be the resistance Rstretched of the wire if it is stretched to twice its original length? Assume that the density and resistivity of the material do not change when the wire is stretched. Express your answer in terms of the wire's original resistance R. • View Available Hint(s) Rstretched = SubmitPart B What is the resistance R3? Express your answer with the appropriate units. µA ? R3 Value %3D
- Battery R₁ R₂ R3 In the circuit above, a 19 V battery is connected to the circuit where R₁ = 30, R₂ = 38 , and R3 = 35 2. What is the current flowing through R₂ in this circuit? • Do NOT include units • Round to 2 decimal points, include zeros if needed. M w MPart a-cPart A A 1.3x10-3 V/m electric field creates a 4.9x1017 electrons/s current in a 1.5-mm-diameter aluminum wire. What is the drift speed? Express your answer using two significant figures. va = 1.12 • 10-6 m/s 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. nνα ΑΣφ ? T = S Submit Request Answer Drovide Cood bools
- Two resistors are connected in series to a battery with an emf of 12 V. The voltage across the first resistor is 2.8 V and the current through the second resistor is 0.17 A. Part A Find the resistance of the first resistor. Express your answer using two significant figures. R₁ Submit Part B [5] ΑΣΦ Request Answer Find the resistance of the second resistor. Express your answer using two significant figures. ? ΩSelect the correct value for each of the quantities listed below. A capacitor of capacitance C= 2.0 µF is initially charged with charge Qo = 6.0 µC. The %3D capacitor is then discharged by connecting it to a resistor of resistance R = 5.0 MN. V V. • The initial voltage of this capacitor is [Select ] At time t = 20 s: • the charge on the capacitor is Q = [Select ] µC, • the voltage across the capacitor is AV= [Select] Y V, • the current in the circuit is I = [ Select ] [ Select ] and the energy stored in the capacitor is U =