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Three resistors of 10, 12 and "x" ohms, respectively are connected in parallel across a constant current source of 8A. Determine "x" if this resistor draws 2.5 A.
Use the classical Runge-Kutta method of order four to solve the initial value problem y' = y-t^2 +1, y(0) =05 and 0 ≤ t ≤ 3 to approximate y(0.72), y(0.72+0.72), y(0.(3×72)), y(0.(4×72)).
Use the classical Runge-Kutta method of order two, Mid-point method, Ralston's method to solve the initial value problem y' =y - t^2 +1, y(0) = 0.5 and 0 ≤ t ≤ 3 to approximate y(0.72), y(0.72+0.72), y(0.(3×72 )), y(0.(4×72)).
Use Euler's method and modified Euler's method to solve the initial value problem dy/dx = 1+x/1+y,
y(1) = 2 and 1≤ x ≤ 4 to approximate y(1.72), y(1.72+0.72), y(1.(3×72)), y(1.(4×72)),
The exact solution is given by y(x)=x+ 1/1-x . Determine the crror at cach step.
Four cubic meters of water is to be heated by means of four 1.5 kW, 230 V immersion heating elements. Assuming the efficiency of the heater as 90%, determine the time required boiling the water if the initial temperature is 20°C and if all four elements are connected in parallel.
An electric water heater has a rating of 1 kW, 230 V. The coil used as the heating element is 10m long and has a resistivity of 1.724 x 10^-6 ohm-cm. Determine the required diameter of the wire in mils?
In an electric heater the inlet temperature is 15°C, water is flowing at the rate of 300 grams per minute. The voltmeter measuring voltage across the heating element reads 120 volts and an ammeter current taken reads 10 amperes. When steady state is finally reached, what is the final reading of the outlet thermometer?
The power drawn by a resistive coil made of copper wire is 220 W at 100 V and 20 °C. Calculate the power consume by the coil at 115 V and 100°C. The temperature coefficient of resistance at 20°C is 0.00393.
If a resistor rated at 5 watts and 6 volts are connected across a battery with an open circuit voltage of 6 volts, what is the internal resistance of the battery if the resulting current is 0.8 A?
An arc lamp takes 10A at 50V. A resistance R is to be place in series so that the lamp may burn correctly from a 110V supply. Find the power wasted in this resistor.
