"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT Courseware 2

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"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT Courseware 2

series law

1) R=R1+R2 means that the total resistance in series is equal to the sum of the resistances in series.

2) The total series resistance is larger than any individual resistance, which is equivalent to increasing the length of the conductor.

3) Series voltage divider: U1/U2=R1/R2

4) R string=nR1

Series voltage divider

The power supply voltage U=3 V, the resistance R1=1 Ω, R2=2 Ω, then

U1=___V, U2=___V.

U=27V, R1=1 Ω, R2=2 Ω, then U1=___V, U2=___V.

U=27V, R1=2 Ω, R2=4 Ω, then U1=___V, U2=___V.

U=27V, U1=18V, R1=2 Ω, then U2=___V, R2=___ Ω.

The resistance of a small light bulb is 8 ohms, and the voltage during normal operation is 3.6 volts. Is it possible to connect this light directly to a 4.5 volt power supply? What size resistor should be connected to _____?

Solution: U2=U-U1=4.5V-3.6V=0.9V

I=U1/R1=3.6V/8Ω=0.45A

R2=U2/I=0.9V/0.45A=2Ω

Answer: A 2Ω resistor should be connected in series.

(2013 Weihai) In the circuit shown in Figure 7, the power supply voltage is 12V, close the switch S, and move the slider P of the sliding rheostat. The small light bulb always does not light up. The current indication number is zero and the voltage indication number is 12V. Then the circuit occurs The fault may be [ ]

A. Poor switch contact B. Ammeter open circuit

C. Sliding rheostat is open circuit D. Light bulb breaks

(2013 Ezhou) In the circuit as shown in the figure, the switch S is closed and the circuit works normally. After a period of time, the light L goes out, the reading on one meter becomes larger, and the reading on the other meter becomes smaller. After exchanging the positions of the dual-purpose electrical appliances and closing the switch S again, the pointers of both electric meters deflected significantly. If there is only one fault in the circuit, and it only occurs on the lamp L or the resistor R, then [ ]

A. Lamp L is short-circuited B. Lamp L is broken

C. Resistor R is open circuit D. Resistor R short circuit

(2012 Heze) Xiaojun used the circuit in Figure 4 to study "the relationship between the current passing through a conductor and its resistance." He conducted two experiments with resistors of 5Ω and 10Ω respectively. After completing the first experiment, Xiaojun will The resistance R between points A and B is changed from 5Ω to 10Ω. After closing the switch, the sliding rheostat should ( )

A. Keep the varistor slide motionless;

B. Move the rheostat slide to the right;

C. Move the rheostat slide to the left;

D. Replace the sliding rheostat with a larger resistance value.

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Update Time: 2024-07-29

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