QUESTION 7 A battery is made up of an unknown number of cells. Each of the cells in the battery is labelled 3V. The battery is connected in a circuit as shown. Ignore the resistance of the battery and the wires. Initially switch S, is open and the voltmeter connected across the ends of the battery reads 24V. 24V) V₂ V₁ 30 100 A 7.1 Does the reading of 24V represent emf or the terminal potential difference? Give a reason for your answer. (2) 7.2 Determine the number of cells in the battery? (1) When switch S, is now closed the ammeter A, reads 2A and V, reads 20V. 7.3 What will be the reading on: 7.3.1 V₁ € 7.3.2 V₂ (1) 7.4 What will the reading on A₂ be if 1,33A of current flows through the 32 resistor? (1) 7.5 How many coulombs of charge flows through A, in 1 second? (1) 7.6 Calculate the total resistance in the circuit. (4) 7.7 How long (in minutes) will it take 4 800J of electrical energy to flow through the 10 resistor? (5) 7.8 If switch S₂ is now opened (while S, remains closed) how will this affect the reading on Va? Explain. (4) (Choose from INCREASES, DECREASES or REMAINS THE SAME) [20] QUESTION 2 Si, water-ethanol, CuSO4, Fe₂O₂, cooking oil-iron fillings, Fe, Cl₂ 2.1. From above list identify the: 2.1.1. Heterogeneous mixture 2.1.2. Semi-metal. 2.1.3. Compound. 2.1.4. Rust. (1) 2.1.5. The substance that exists as a gas at room temperature. 33333 (1) (1) (1) (1) 2.2. Now, consider thoroughly stirred water-ethanol at room temperature. 2.2.1. Is this a homogeneous or heterogeneous mixture? (2) Explain the answer. 2.2.2. Name a suitable separation technique that can be used to separate (1) water-ethanol mixture 2.2.3. Name the physical property used in this technique mentioned in 2.2.2 (1) 2.2.4. Which component of the mixture will be left behind? 2.2.5. Why is this mixture considered miscible? 88@ (1) (2) QUESTION 2 2.1. Si, water-ethanol, CuSO4, Fe₂O₂, cooking oil-iron filings, Fe, Cl₂ From above list identify the: 2.1.1. Heterogeneous mixture 2.1.2. Semi-metal. 2.1.3. Compound. 2.1.4. Rust. (1) (1) (1) (1) 2.1.5. The substance that exists as a gas at room temperature. (1) 2.2. Now, consider thoroughly stirred water-ethanol at room temperature. 2.2.1. Is this a homogeneous or heterogeneous mixture? (2) Explain the answer. 2.2.2. Name a suitable separation technique that can be used to separate water-ethanol mixture (1) 33 2.2.3. Name the physical property used in this technique mentioned in 2.2.2 (1) 2.2.4. Which component of the mixture will be left behind? 2.2.5. Why is this mixture considered miscible? (1) (2) [12] QUESTION 3 3/6 The two graphs (not drawn to scale) below represent the change in temperature of two substances, X and Y, when heated for a certain time. Both substances were in the solid phase at 1-0 minutes. Substance Y Substance : Time (minutes) ... (2)

Can someone help with H through J, thank you!

A circuit is constructed with four resistors, one capacitor, one battery and a switch as shown. The values for the resistors are: R₁ = R₂ = 52 0, R3 = 1110 and R4 = 143 Q. The capacitance is C = 75 uF and the battery voltage is V 12 V. The positive terminal of the battery is indicated with a + sign. Submit Help Submit Help V Submit Help [ R₂ 1) The switch has been open for a long time when at time t = 0, the switch is closed. What is 14(0), the magnitude of the current through the resistor R4 just after the switch is closed? Submit Help R4 ww 2) What is Q(), the charge on the capacitor after the switch has been closed for a very long time? R₂ Submit Help Ic 3) After the switch has been closed for a very long time, it is then opened. What is Q(topen), the charge on the capacitor at a time topen = 766 us after the switch was opened? с + μC + A με + 4) What is Ic,max(closed), the current that flows through the capacitor whose magnitude is maximum during the time when the switch is closed?…

The circuit shown below has a 15 V battery connected to two resistors in series with R1 = 50 2 and R2 = 30 Q. R, 1. What is the total equivalent resistance Rtot of the circuit? Rtot Ω = %3D Submit Answer Tries 0/2 What are the magnitudes of the currents I1 and I2 in resistors R1 and R2, respectively? I1 = A %3D I2 = A Submit Answer Tries 0/2 What are the magnitudes of the potentials V1 and V2 across resistors R1 and R2, respectively? V1 = V2 =

A portion of a circuit is shown in the figure, and the batteries have no internal resistance. What is the potential difference VA - VB if I = 5.0 A?

The circuit in the figure below contains two resistors, R₁ = 1.7 k and R₂ = 2.7 km, and two capacitors, C₁ = 2.3 μF and C₂ = 3.1 μF, connected to a battery with emf E = 100 V. If there are no charges on the capacitors before switch S is closed, determine the charges 9₁ and 92 on capacitors C₁ and C₂, respectively, as functions of time, after the switch is closed. Hint: First reconstruct the circuit so that it becomes a simple RC circuit containing a single resistor and single capacitor in series, connected to the battery, and then determine the total charged a stored in the circuit. (Use the given values for R₁, R₂, C₁, C₂, and E. Use the following as necessary: t. Do not include any units in your response.) 91 = 92= μC μc R₁ www R₂ S + d E C₂

In the figure the current in resistance 6 is ig = 1.48 A and the resistances are R1 = R2 = R3 = 2.23 Q, R4 = 16.5 Q, R5 = 8.09 Q, and Ré = 4.10 Q. What is the emf of the ideal battery? R R2 R, Rg R4 tatatat Number i Units

1. Identical lightbulbs are connected to identical batteries in three circuits. A (a) The voltage of the battery in circuit 2 is 12 V. What is the voltage of bulbs B and C? Explain. (2) (3) (b) The current through the battery of circuit 3 is 3 A. What is the current through bulb D and bulb E? Explain. B

Needs Complete solution.

The figure below shows a battery connected to a circuit. The potential difference across the battery and the resistance of each resistor is given in the figure. 25.0 V 10.5 Ω 10.5 Ω 4.00 Ω 4.00 Ω 20.0 Ω A rectangular circuit begins at its left side at a 25.0 V battery with the positive terminal on top. From the battery, the circuit extends up and to the right to point b. The circuit continues rightward from point b and splits into three parallel vertical branches. The leftmost branch has a resistor labeled 10.5 Ω, the middle branch has a resistor labeled 4.00 Ω and the rightmost branch, from top to bottom, goes through a resistor labeled 4.00 Ω, point c, and a resistor labeled 20.0 Ω. The three branches recombine, the circuit extends to the left passing through point a, bends upward to a resistor labeled 10.5 Ω and reaches the negative terminal of the battery. (a) What is the magnitude of the potential difference (in V) between points a and b in the circuit?   (b) What is the…