Switch Bulb A Bulb B FIGURE Q23.27

When the fourth bulb is removed, how does the brightness of bulbs 1 and 2 change?a. 1 stays the same, 2 stays the sameb. 1 gets brighter, 2 gets brighter c.1 gets brighter, 2 stays the samed. 1 gets dimmer, 2 stays the samee. 1 gets dimmer, 2 gets dimmer

4. The circuit contains four parallel plate capacitors, all initially uncharged and with no dielectric material between their plates. A switch is closed to complete the circuit at time t=0, so current begins to flow at that time and we wait enough time for the capacitors to become (very close to) fully charged. a. What is the equivalent capacitance of this circuit?    b. What is the charge stored on the 125 µF capacitor?   If we now insert a neoprene rubber dielectric into all of the capacitors, how will the answers change? c. What is the equivalent capacitance of this circuit?   d. What is the charge stored on the 125 µF capacitor?

Q = Qo e* (C36) d) The capacitor charge in the circuit below decays exponentially when the capacitor has an initial charge of Qo: URC. Give brief physics (not math!) explanations for the observation that the time constant (how long it takes to discharge) is proportional to both C and R. Why is the time constant proportional to R (i.e. why does it take longer when R is bigger)? Why is the time constant proportional to C (i.e. why does it take longer when C is bigger)? R C

Consider the circuit below. Assume that the capacitor is initially uncharged. V₁=24 V R = 10 ΚΩ : R2 = 30 ΚΩ www Description of Image a. What is the initial current through resistor R₂ when the switch is closed (t = 0)? Current through R₂ at t = 0 is 8 O = 0.8 mA. Hint O O O C₁ = 10 μF b. What is the current through resistor R₂ when the capacitor is fully charged, long after the switch is closed (t→ ∞)? Current through R₂ as t→∞ is 6 O = 0.6 mA. c. What happens if the switch is opened after it has been closed for some time? Choose the most correct statement below. Current flows through C₁ but not R₁ or R₂. Current flows through V₁, R₁, R2, and C₁. Current flows through R₁ and C₁ but not R₂. No current flows anywhere in the circuit. Current flows through C₁ and R₂ but not R₁. Current flows through R₁ and C₁ but not R₂. X In time t = initial value. d. If the switch has been closed for a time period long enough for the capacitor to become fully charged, and then the switch is opened, how…

You want to use two light bulbs to light a room but only have one battery to power them. The greatest possible light will be produced by hooking them up: A. in parallel B. in series  is it A or B?

Your turn... a. The battery in the circuit above is replaced with a 12-volt battery. Calculate the new current and bulb voltages. b. A 12-volt battery is connected in series to 1 Q and 5 Q bulbs. What is the voltage across each bulb? ter 21 ELECTRICAL SYSTEMS Section 21.1 Review 1. What do you know about the current at different points in a series circuit? 2. Three bulbs are connected in series with a battery and a switch. Do all of the bulbs go out when the switch is opened? Explain. 3. What happens to a circuit's resistance as more resistors are added in series? 4. A series circuit contains a 9-volt battery and three identical bulbs. What is the voltage drop across each bulb? 5. A circuit with three 1.5-volt batteries has two matching light bulbs (Figure 21.7). a. What is the voltage drop across each bulb? b. What would you have to know to find the value for the circuit's current? 6. A student builds a circuit using three 1-ohm resistors in series. The current in the circuit is 1.5…

Consider following circuit with R1 = 62 Ω, R2 = 11 Ω, R3 = 62 / 10 Ω, R4 = 11/10 Ω and and ξ=11 V e. Calculate currents i1 , i2  and i3 ? f. Calculate the potential difference of R2 ? g. Calculate the potential difference of R3 ? h. Calculate the heat dissipation of R2 resistor  i. Cross sections through two long conductors of the same length and material, with square crosssections of edge lengths are shown below. Conductor Y fits snugly within conductor X, Rank theresistance of X and Y?

A simple series circuit consists of a 140 2 resistor, a 24.0 V battery, a switch, and a 3.20 pF parallel-plate capacitor (initially uncharged) with plates 5.0 mm apart. The switch is closed at t=0s. ▾ 80 F3 a F4 BB Part A After the switch is closed, find the maximum electric flux through the capacitor. Express your answer in volt-meters. ▸ View Available Hint(s) ΜΕ ΑΣΦ ? Submit Part B V.m After the switch is closed, find the maximum displacement current through the capacitor. Express your answer in amperes. ▸ View Available Hint(s) ΜΕ ΑΣΦ Submit Part C Find the electric flux at t=0.50 ns. Express your answer in volt-meters. ▸ View Available Hint(s) F6 % 25 6 & 28 7 A বর DII DA F7 N E R T Y U D F G H 80 r F9 9 0 K 0 F10 L P

C2 C1 XS R 5. From the figure above, a pair of charged capacitors are given C1 and C2 = 2 µF which are charged with a battery of 12 V. Determine then, how much charge between both capacitors is left after the switch has closed for over 1ms? How much is left for the capacitors C1 and C2? Lastly, determine the . 1 μF current of the circuit after this time.