G11 ELECTRIC CURRENTS

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why the batteries will be warm a period of time?

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answer: c

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How can we get an output of 3.0 V from a battery of e.m.f. 6.0 V?

Multiple Choice

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what is the difference between fixed resistor and rheostat?

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answer d

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answer: b

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answer: a

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what is LDR (light-dependent resistors)?

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What is thermistor?

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State two similarities between an LDR and a thermistor.

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Explain how a thermistor can be used as a transducer.

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https://docs.google.com/presentation/d/1ZiHc6E8Ew6QkQa29wQVo2ZuhyYDPBebw79nz9b9WHLc/edit?usp=sharing

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A standard cell of e.m.f. 1.230 V gives a balance length of 31.2 cm. Use this value to obtain a more accurate value for E.

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To make a potentiometer, a driver cell of e.m.f. 4.0 V is connected across a 1.00 m length of resistance wire. What is the potential difference across each 1 cm length of the wire? What length of wire has a p.d. of 1.0 V across it?

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To make a potentiometer, a driver cell of e.m.f. 4.0 V is connected across a 1.00 m length of resistance wire. A cell of unknown e.m.f. E is connected to the potentiometer and the balance point is found at a distance of 37.0 cm from the end of the wire to which the galvanometer is connected. Estimate the value of E. Explain why this can only be an estimate.

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https://docs.google.com/presentation/d/1a8XmYV3i1LO8zU52AYg56gljxrT9L_DEkl5qTyfilUE/edit?usp=sharing

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An electrical component allows a current of 10 mA through it when a voltage of 2.0 V is applied. When the voltage is increased to 8.0 V, the current becomes 60 mA. Does the component obey Ohm’s law? Give numerical values for the resistance to justify your answer.

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The graph in Figure 10.6 shows the I–V characteristics of two electrical components, a filament lamp and a length of steel wire.

a. identify which curve relates to each component.

b. State the voltage at which both have the same resistance.

c. Determine the resistance at the voltage stated in part b.

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A student connects a circuit with an NTC thermistor, a filament lamp and a battery in series. The lamp glows dimly. The student warms the thermistor with a hair dryer. What change will the student notice in the brightness of the lamp? Explain your answer.

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arrange series and parallel circuit!

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what is an electric current?

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unit for electric currents?

Multiple Choice

The direction of current is from POSITIVE to NEGATIVE

• TRUE

• FALSE

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Current is measured by?

• ammeter

• amateur

Multiple Choice

The direction of electrons is from POSITIVE to NEGATIVE

• TRUE

• FALSE

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how much the charge of electrons and protons?

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WHAT IS POTENTIAL DIFFERENCE?

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UNIT FOR POTENTIAL DIFFERENCE?

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A TOOL FOR MEASURING POTENTIAL DIFFERENCE?

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answer: D

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Answer: A

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answer c

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have you ever heard about light-dependent resistor? what is it? and what it used for in real life?

Multiple Choice

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have you ever heard about thermistor? what is it? and what it used for in real life?

Multiple Choice

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another name of potential difference?

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answer: c

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answer: d

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answer: c

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answer: a

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answer b