Exam 31: Fundamentals of Circuits

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S₁ and S₂ are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?

The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10^-6 Ω ∙ m. If the toaster is operated at a voltage of 120 V, how much power does it draw?

Four resistors are connected across an 8-V DC battery as shown in the figure. The current through the 9-Ω resistor is closest to

For the circuit shown in the figure, all quantities are accurate to 2 significant figures. What is the value of the current I₁?

For the circuit shown in the figure, what current does the ideal ammeter read?

A certain electric furnace consumes 24 kW when it is connected to a 240-V line. What is the resistance of the furnace?

The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 V and 60 W. Assume the resistance of the filament of the bulb is constant and is independent of operating conditions. If the light bulb is operated with a current that is 50% of the current rating of the bulb, what is the actual power drawn by the bulb?

For the circuit shown in the figure, the switch S is initially open and the capacitor voltage is 80 V. The switch is then closed at time t = 0. What is the charge on the capacitor when the current in the circuit is 33 μA?