An electric immersion heater normally takes 95.0 min to bring cold water in a well-insulated container to a certain temperature, after which a thermostat switches the heater off. One day the line voltage is reduced by 5.00% because of a laboratory overload. How long does heating the water now take? Assume that the resistance of the heating element does not change. Number Units

The current in a simple single resistor (of resistance R1) circuit is I1 = 5.1 A. A second resistor, R2 = 97 Ω, is added to the first in parallel and the current through the battery increases to I2 = 8.6 A. Input an expression for the resistance of R1.

You are working in a lab where RC circuits are used to delay the initiation of a process. One particular experiment involves an RC circuit with a half-life of t₁/2 life needs to be extended. He asks you to change the resistance of the circuit to make the half-life longer. All you can find in the supply room is a single 35.0 old to extend the half-life of the circuit. Determine the new half-life (in s). = 3.00 s. Your supervisor is concerned that the initiation of the process is occurring too soon and that the half- resistor. You look at the RC circuit and see that the resistance is 26.0 0. You combine the new resistor with the

The heating element of a coffeemaker operates at 120 V and carries a current of 4.50 A. Assuming the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat 0.715 kg of water from room temperature (23.0°C) to the boiling point. min