In the figure an array of n parallel resistors is connected in series to a resistor and an ideal battery. All the resistors have the same resistance. If an identical resistor were added in parallel to the parallel array, the current through the battery would change by 6.67%. What is the value of n? Number 3R 1 n resistors in parallel R exact number, no tolerance Units No units

If one wants to design a 1500 W electrical heater that consists of a resistor R with V = 208 V across it, what value should be chosen for R?

You are given a number of 12 Q2 resistors, each capable of dissipating only 4.0 W without being destroyed. What is the minimum number of such resistors that you need to combine in series or in parallel to make a 120 resistance that is capable of dissipating at least 11.9 W? Number i ! Units No units

A certain metal has a temperature coefficient of resistivity of 0.0058 (°C) -¹. A wire made from that material is connected to a source of constant voltage via a switch. At the instant the switch is closed, the temperature of the wire is 30 °C, and the initial power dissipated in the wire is Po. At what wire temperature has the power dissipated in the wire decreased to (1/2)Po? Number i Units

An unknown resistor is connected between the terminals of a 3.00 V battery. Energy is dissipated in the resistor at the rate of 0.670 W. The same resistor is then connected between the terminals of a 1.50 V battery. At what rate is energy now dissipated? Number i Units