Electricity , Direct Current, Practical Electricity - worksheets
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KRISHNAVENI INTERNATIONAL SCHOOL Grade 10 IGCSE Name: 1. 2. 3. 4. 5. Electric Current Explain what is meant by electric current. Complete the following table. symbol Time: 45 min Date of submission : 4 Sep 2017 S.I. Unit symbol (a) (b) Quantity name charge electric current name During the flash from a camera bulb, 5.0 C of charge flows for 0.25 s. What is the average current? The current through an electric bulb is 5 A. How much charge flows through the bulb in 5 minutes? Find the time taken for 8 C of charges to flow through a circuit carrying 300 mA of current.
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Electromotive force and potential difference 1. 2. 3. 4. 5. Define the electromotive force of a cell. Complete the following table. Quantity S.I. Unit name (a) electromotive force (b) potential difference symbol name symbol The total energy dissipated when a charge of 20 C flows from a battery is 60 J. What is the e.m.f of the battery? The potential difference across a conductor is 6.0V. What is the energy dissipated when (a) (b) 3.2 C of charge flows through it? a current of 5.0 A flows for 1 minute? is used to measure the potential difference across a resistor and it must be connected in with the resistor.
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Resistance 1. 2. 3. Define resistance and state its S.l. unit. Calculate the resistance of the following resistors if (b) The current is 2.0 A when the potential difference is 12.0 V. The current is 4.0 mA when the potential difference is 1.8 V. With reference to the circuit, 15 v 50 Q (a) (b) (c) what is the reading on the ammeter? calculate the charge that flows through the battery in 2 mins. what is the reading on the voltmeter?
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4. 5. Complete the table below to show the resistance of a metallic wire when the length and cross-sectional area of the wire changes. length 21 21 31 area Resistance/Q 20 Calculate the effective resistance of the following circuit. (a) (b) (c) (d)
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6. 7. The figure below shows the V/l (voltage-current) characteristic graphs for two components, P and Q, at constant temperature. 3 voltage 2 1 0.2 0.4 0.6 current (a) Which component obeys Ohm's Law? Explain your answer. (b) Find the resistance of P. Sketch the V/l graph for: (a) a metallic conductor at constant temperature, (b) a filament lamp.
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Electric Current, EMF & P.D. 2 3 4 5 In an electric circuit, a charge of 60 C flows past a point in 10 s. What is the current in the circuit? A current of 10 A flows through an electric heater for 10 mins. What is the total charge through the heater? The current through an electric bulb is 500 mA. Find the time taken for 150 C of charge to flow through the bulb. The diagram shows an electric circuit in which a direct current is flowing. (a) Calculate the number of electrons per second passing a point B, in the wire, when a current of 0.7 A is flowing. [The charge on an electron is 1.6 x 10-19C.] (b) Show on the diagram the direction in which these electrons move past the point B. A battery is charged for 6 hours using a current of 0.50 A. Calculate (a) (b) the total charge which flows through the battery, the work done in passing this charge through the battery if the average voltage between the battery terminals during charging is 1 1.0 V.
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6 7 8 How much energy is transferred by a battery of e.m.f. 4.5 V when 1.0 C of charge passes through it? The work done in moving a charge of 2 C from one point A to another point B on the same wire is 5 J. Calculate the p.d. between points A and B. When a current of 0.25 A flows through a lamp for 2 minutes, 3 300 J of energy is transformed. What is the potential difference across the lamp? Series Circuits 2. 3. 4. 5. What quantity is the same at every point in a series circuit? State the formula to calculate the effective resistance of two resistors, RI and R2 connected in series. In the diagram below, state the formula that links V, VI and V2 in the box provided. The instrument to measure current flow in a circuit is an and it must be connected in in a circuit. The instrument to measure potential difference across a component is a and it must be connected in across the component.
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6. 7. (a) (b) (c) Calculate the current flowing through the 5 Q resistor, given that the voltage of one cell is 1.2 V. Calculate the potential difference across the 2 Q resistor. On the diagram above, draw in the position of the ammeter that will measure the total current flowing in the circuit. The circuit below shows a cell connected to two resistors in series. (a) (b) (c) A voltmeter is used to measure the potential difference across the 4 Q resistor. On the diagram, show how the voltmeter is connected in the circuit. The potential difference across the cell is 1.5 V Calculate the total resistance in the circuit. the current in the cell. Using your answer to (b) (ii), state the value of the current in the 4 Q resistor, calculate the charge flowing through the 4 Q resistor in 10 s.
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Exercise : Parallel Circuits 1. 2. A circuit is set up as shown. (a) (b) (c) (d) Calculate the effective resistance of the two resistors. Calculate the total current, I flowing through the circuit. State the reading on the voltmeter, VI. Calculate the current flowing through the 2 Qresistor. Calculate the current flowing through the 4 Qresistor. 1.5 v VI 11 1 12 Another circuit is set up as shown. (a) (b) (c) (d) If Il = 1 A, calculate the reading on the voltmeter, VI. 11 1 12 State the reading on voltmeter, V2. Calculate the total current, I flowing through the circuit. State the e.m.f of the cell. VI
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Exercise : Series and Parallel Circuits Find the equivalent resistance of the circuits below. (a) IQ 20 20 -Q 8 30 2. Explain how will the readings on the ammeters Al and A2 be affected when the switch S is closed? Reading in Al: Increase / Decrease Explanation: Reading in AZ Increase / Decrease Explanation: 13 Al 12 11 3 s 3 Refer to the circuit below. VI = 4 V What is the voltmeter reading V2? What is the ammeter reading I?
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4. A (a) (b) O is now added to the circuit as shown. Calculate the current through the 4 Q resistor. Calculate the current through the 2 Q resistor. Find the resistance of resistor R. 10 v
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6. 7. In the circuit below, all resistors are identical. Calculate the total current drawn from the battery. The diagram below shows two resistors RI, R2 and a lamp L connected to a 24 V supply with their respective current values in the table below. The lamp L has a resistance of 2.0 Q. 24 v Component RI RI What are the resistance of RI and R2? Current/A 4.0 2.0
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