•10 (a) In Fig. 27-28, what value must R have if the current in the E- circuit is to be 1.0 mA? Take &, = 2.0 v, E = 3.0 V, and rn =n= 3.0 0. (b) What is the rate at which thermal en- ergy appears in R? Tg
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- • If the dark saturation current of a solar cell is 1.7X10-8 A/m?, the cell temperature is 27 °C, and the short-circuit current density is 250 A/m?, Vmax = 0.526 V. Calculate the open-circuit voltage, Voci current density at maximum power, Imax; maximum power, Pmavi and maximum efficiency, nmare When the available solar radiation is 820 W/m?(a) In the figure what value must R have if the current in the circuit is to be 1.1 mA? Take ₁ = 2.6 V, E2 = 3.9 V, and r₁ r2 = 3.6 Q. (b) What is the rate at which thermal energy appears in R? ww 4a)(i) What is the accuracy of a measurement of 26.5gm taken as against 25gm? (ii) State the types of resistor colour band in use and hence determine the colours of the following resistors: (i) K39±10%; (ii) M56±1%; (iii) 3K9±10%; (iv)120K±2% (v) 8R8±10%
- A steady current of 10.0 A is passed through a water voltameter for 300 s. Estimate the volume of hydrogen evolved at standard temperature and pressure. Use the known value of Faraday's constant. Relative molecular mass of H, is 2.016 and molar volume = 22.4 litres (volume of 1 mol of an ideal gas at STP). trolusisCheck your Understanding Repeat the calculations from the previous example for I0=0.040A .Tha values are 5.20 V, 1.16 mA, and 2.04 mA
- Wo resrstors Gol Hnaid62m parallel are Comneted to tte Hermonale ofa battery Conb16Ang baltay Gnbiftng dn Emf four Cells gach havmg '0f bsv , tf the Cerent maferres Corre Hhe fr Corl rs O.GA; Fmde) トn the Cunre 42 Corl rs O.GA; t m the Br Col. bJ the the mternal regstence of batterut of Jestion R www Battery The measured value of the voltage is V = 5.9 + 0.4 V and that of the resistance is R = 14 + 0.5 O. The current through the circuit (in Ampere (A)) can be calculated using the formula, I =V/R. Calculate the, a) Current (in Ampere) = 0.42 b) Fractional uncertainty in the current = c) Absolute uncertainty (in Ampere) in the current =Suppose we have a steady current / in a wire of cross-sectional area A and length L. The current enters the wire at the end a and leaves at end b. The potential difference across the wire is electric field is given by Va-Vb =Vab = EL Vab =pJ%3p- The LA new expressure for the potential difference is given The SI unit of resistance is one ohm R=p- A by Vab=pL- = IR A Where %3D (1 Q). A resistor is a device made to have a certain resistance. If the potential difference is 6.0 V across a 4.0-k2 resistor, what is the current through it? 1.5 x10-A 15 x10-3A 4 x 10 A 4.0 x 10-3 A Click Save and Submit to save and submit. Click Save All Answers to save all answers.
- Integrated ConceptsHow much time is needed for a surgical cauterizer to raise the temperature of 1.00 g of tissue from 37.0oC to 100oC and then boil away 0.500 g of water, if it puts out 2.00 mA at 15.0 kV? Ignore heat transfer to the surroundings.Assuming a 60 Hz, how much time – in seconds – is the peak positive current behindthe peak positive voltage when the current lags the voltage by:a. 90 degreesb. 0 degreesc. 60 degrees(a) In the figure what value must R have if the current in the circuit is to be 1.5 mA? Take &₁ = 2.3 V, E2 = 3.8 V, and r₁ r2 = 4.4 2. (b) What is the rate at which thermal energy appears in R? E₁ R www (a) Number (b) Number ww i i 18. Units Units