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Спасибо, что выбрали Дентамед
Спасибо, что выбрали Дентамед
Common question:
Draw a circuit with a battery, switch, bulb, ammeter (to measure current through bulb), and voltmeter (to measure voltage across bulb).
Correct arrangement:
Exercise: Identify the mistake: “A student connects a voltmeter in series with a bulb. What happens?”
(Answer: Very little current flows because voltmeter has high resistance; bulb barely lights.)
Although F2 sometimes introduces ( P = V \times I ), try this:
Question: A 6 V bulb draws 0.5 A. What is its power and resistance?
Solution:
( P = V \times I = 6 \times 0.5 = 3 , \textW )
( R = \fracVI = \frac60.5 = 12 , \Omega )
Circle the correct answer.
D1. Draw a circuit diagram with:
(Label all components clearly – 5 marks)
D2. A student builds two circuits with two identical bulbs.
| Circuit | Type | Bulb brightness | If one bulb breaks, other? | |---------|------|----------------|----------------------------| | A | Series | ? | ? | | B | Parallel | ? | ? |
Complete the table:
(5 marks)
Q1. Which statement correctly describes the current in a series circuit? A) It is different at different points. B) It is the same at all points. C) It is zero after the first bulb. D) It is higher before the bulb than after.
Q2. Three identical bulbs are connected in parallel to a 6V battery. What is the voltage across each bulb? A) 2V B) 3V C) 6V D) 18V
Q3. An ammeter must always be connected in: A) Parallel to the component B) Series with the component C) Across the battery D) Reverse direction
Question Example:
A 12 V battery is connected to a 4 Ω resistor. What is the current?
Solution:
( I = \fracVR = \frac124 = 3 , \textA )
Exercise for you:
If a current of 0.5 A flows through a 20 Ω heating coil, what voltage is applied?
(Answer: ( V = 0.5 \times 20 = 10 , \textV ))
Common question:
Draw a circuit with a battery, switch, bulb, ammeter (to measure current through bulb), and voltmeter (to measure voltage across bulb).
Correct arrangement:
Exercise: Identify the mistake: “A student connects a voltmeter in series with a bulb. What happens?”
(Answer: Very little current flows because voltmeter has high resistance; bulb barely lights.)
Although F2 sometimes introduces ( P = V \times I ), try this:
Question: A 6 V bulb draws 0.5 A. What is its power and resistance?
Solution:
( P = V \times I = 6 \times 0.5 = 3 , \textW )
( R = \fracVI = \frac60.5 = 12 , \Omega )
Circle the correct answer.
D1. Draw a circuit diagram with:
(Label all components clearly – 5 marks)
D2. A student builds two circuits with two identical bulbs.
| Circuit | Type | Bulb brightness | If one bulb breaks, other? | |---------|------|----------------|----------------------------| | A | Series | ? | ? | | B | Parallel | ? | ? |
Complete the table:
(5 marks)
Q1. Which statement correctly describes the current in a series circuit? A) It is different at different points. B) It is the same at all points. C) It is zero after the first bulb. D) It is higher before the bulb than after.
Q2. Three identical bulbs are connected in parallel to a 6V battery. What is the voltage across each bulb? A) 2V B) 3V C) 6V D) 18V
Q3. An ammeter must always be connected in: A) Parallel to the component B) Series with the component C) Across the battery D) Reverse direction
Question Example:
A 12 V battery is connected to a 4 Ω resistor. What is the current?
Solution:
( I = \fracVR = \frac124 = 3 , \textA )
Exercise for you:
If a current of 0.5 A flows through a 20 Ω heating coil, what voltage is applied?
(Answer: ( V = 0.5 \times 20 = 10 , \textV ))
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