Essential Electricity Homework Exercise 1

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1 Homework Exercise 1 1. For each of the following electrical symbols, copy the symbol into you jotter and label it using the words below. Word bank resistor, voltmeter, battery, ammeter, bulb V A 2. State the energy change in each of the following: (a) Lamp (b) Battery (c) Electric motor (d) Electric buzzer 3. Draw (neatly) a series circuit with a battery, a switch and a lamp.

2 Homework Exercise 2 1. What is used to measure electrical current in a circuit? 2. Describe what is meant by electrical current. 3. What is electrical Current is measured in? 4. For each of the circuits copy the diagram and fill in any missing Current and Voltage values; (a) 12V 5A (b) 3V 3A 1A 3V

3 Homework Exercise 3 1. What is used to measure Voltage in a circuit? 2. Name the unit Voltage is measured in? 3. For each of the circuits copy the diagram and fill in any missing Voltage values; (a) 6 V 3A (b) 2V 4A 2A 3V

4 Homework Exercise 4 1. Describe the energy change in a resistor. 2. Name the unit Resistance is measured in? 3. What meter is used to measure resistance? 4. A resistor has a voltage of 6V across it and a current of 2A through it. Calculate the value of the resistor. 5. If the resistance in a circuit increases what happens to the current in the circuit? 6. Variable resistors can be used for speed control of a remote control car. Can you name 2 other uses?

5 Homework Exercise 6 1. A variable resistor is used in the speed controller of a toy electric train. The variable resistor controls the current flowing to a small electric motor in the train shown in figure 1 2. Copy the diagram and complete it by adding a variable resistor At one particular speed the voltage across the variable resistor is 6.0 volts and the current flowing through it is 0.3 amperes. a. Calculate the resistance of the variable resistor b. What is the current flowing through in the motor? The resistance of the variable resistor in the speed control is now decreased c.what will happen to the current following in the motor? d. What effect will this have on the speed of the toy train? e. Give two other uses of a variable resistor

6 Homework Exercise 7 1. A resistor has a voltage across it of 12 volts and a current through it of 2.5 amperes. Calculate the resistance of the resistor. 2. A voltage of 6 volts is across a resistor where the current is 0.5 amperes. What is the value of the resistor? 3. Calculate the resistance of a component when a voltage of 24 V causes a current of 0.1 amperes. 4. If a current of 2 amperes exists through a lamp when it has 12 volts across it, what is the resistance of the lamp? 5. A torch bulb is marked "6 V, 0.25 A. Calculate the resistance of the bulb. Solution

7 Extra Revision Questions 1 1. Draw the circuit diagram symbols for a battery, a bulb and a resistor? 2. Sort the following materials into conductors or insulators. Show your answers in a table. Gold, rubber, plastic, copper, carbon, wood, air, silver, aluminium, paper, lead, wool. 3. What would you use to measure resistance? 4. For each of the circuits copy the diagram and fill in any missing Current and Voltage values; (b) 24V 8A (b) 9V 6A 3A 12V

8 Extra Revision Questions 2 1. Which has a higher resistance rubber or copper? 2. Which has a higher resistance a thick wire or a thin wire. 3. A resistor has a voltage of 9V across it and a current of 3A through it. Calculate the value of the resistor. 4. State three advantages of a ring circuit. 5. Can you design a circuit that would allow you to test for faults in a circuit? Draw a neat diagram of the circuit.

9 Extra Revision Questions 3 Essential Electricity 1. Draw and label the symbols for a battery, a lamp, a switch a resistor and a variable resistor. 2. How do you tell the difference between a parallel circuit and a series circuit? 3. What happens to the brightness of a bulb in a series circuit if you increase the resistance? 4. On this circuit, draw an ammeter to measure the current and a voltmeter to measure the voltage across the bulb. Make sure you show how ammeters and voltmeters are connected into a circuit. 5. A small motor operates at 12 volts and carries a current of amps. What is the resistance of the motor? 6. What is an ohm-meter used to measure?

7. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy? 1) 10 s 3) 1,000 s 2) 100 s 4) 100,000 s

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