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Introduction to internal resistance: 6th year Higher Physics
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This document discusses parallel circuits and measuring current and voltage in a parallel circuit. It summarizes that in a parallel circuit, current has multiple paths to flow and the total current from the supply equals the sum of the currents in each parallel branch. It also states that the voltage across components in parallel is the same and equals the supply voltage.
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1) The document describes setting up a circuit with a resistor and power supply to take voltage and current readings at different voltages.
2) It involves plotting a graph of voltage vs. current and determining the gradient, which represents resistance. Ohm's law that voltage equals current times resistance is also covered.
3) Resistors are used to control current and voltage in circuits. Their properties in series and parallel circuits are discussed.
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This document discusses using a Wheatstone bridge circuit to measure resistance. It provides instructions on how to set up the circuit with 3 known resistors and 1 unknown resistor. When balanced, the voltmeter will read 0 and the resistance values can be used to calculate the unknown resistance. It notes that when slightly unbalanced, the voltmeter reading is directly proportional to the change in resistance, allowing it to be used as a measuring device near the balance point.
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This document discusses using a Wheatstone bridge circuit to measure resistance. It provides instructions on how to set up the circuit with 3 known resistors and 1 unknown resistor. When balanced, the voltmeter will read 0 and the resistance values can be used to calculate the unknown resistance. It notes that when slightly imbalanced, the voltmeter reading is directly proportional to the change in resistance, allowing it to be used as a measuring device near the balance point.
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The document describes the male and female reproductive systems. The male system includes the testes, sperm duct, prostate, urethra and penis which work together to produce and release sperm. The female system includes the ovaries, oviducts, uterus, cervix and vagina which work to produce and release eggs, allow fertilization to occur and support fetal development. Fertilization happens when a single sperm meets and enters an egg in the oviduct, joining their nuclei to form a fertilized egg or zygote.
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This document discusses parallel circuits and measuring current and voltage in a parallel circuit. It summarizes that in a parallel circuit, current has multiple paths to flow and the total current from the supply equals the sum of the currents in each parallel branch. It also states that the voltage across components in parallel is the same and equals the supply voltage.
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1) The document describes setting up a circuit with a resistor and power supply to take voltage and current readings at different voltages.
2) It involves plotting a graph of voltage vs. current and determining the gradient, which represents resistance. Ohm's law that voltage equals current times resistance is also covered.
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This document discusses using a Wheatstone bridge circuit to measure resistance. It provides instructions on how to set up the circuit with 3 known resistors and 1 unknown resistor. When balanced, the voltmeter will read 0 and the resistance values can be used to calculate the unknown resistance. It notes that when slightly unbalanced, the voltmeter reading is directly proportional to the change in resistance, allowing it to be used as a measuring device near the balance point.
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The mother is now in labor, with the baby surrounded by a sac of fluid in the uterus. As contractions push the baby out, the sac bursts, releasing the fluid. When born, the baby is still attached to the placenta by the umbilical cord, which must be cut and tied before the placenta is delivered, in the afterbirth.
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The document discusses resistance and Ohm's law. It describes setting up a circuit with a resistor and power supply to take voltage and current measurements. By plotting the measurements on a graph and calculating the gradient, resistance can be determined using the equation R=V/I. Resistance is measured in Ohms and represents an object's opposition to electric current. Ohm's law states that voltage equals current times resistance. Resistors are used to control current and voltage in circuits. Power dissipated in a resistor is calculated using P=IV or P=I^2R. Resistors in series increase total resistance while resistors in parallel decrease total resistance.
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The document summarizes a chemistry class where students conducted experiments on chemical reactions and reviewed concepts like chemical changes, mixtures, and compounds. It provides instructions for upcoming homework assignments and announces a test on chemical reactions. Students performed experiments involving the reaction of magnesium with oxygen, adding marble chips to hydrochloric acid, and mixing chemical solutions, observing physical changes in each case. The class then reviewed the results and key characteristics of chemical reactions.
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This document discusses metals reacting with acids to form salts and hydrogen gas. The key points are:
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This document discusses metals reacting with acids to form salts and hydrogen gas. The key points are:
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