understandingConcepts

7-12 and 19 on oage 172

7. A good conductor of electricity is also a good conductor of heat because they are both forms of energy which the conductor conducts.

8. The brighteness of a light bulb when the current that flows through is increase becomes brighter because there is more energy to make light waves.

9. You should get a new tutor because a voltage is the amount of electricity in a current that is released and a ampere is the rate at which the current goes in a second.

10. Circuit 5 will light the bulb because the positive side touches the bottom and the negative side touches the side which completes a circuit.

11. There is more electric energy that flows out of the battery and less coming back in because some electric energy is converted into light waves having less electric energy leave the bulb because the bulb is the resistor that changes some of the electric energy into light energy.

12. The rest of the energy that flows out of a light bulb goes back to the power source to complete the circuit.

19. The brightness of bulb A and B is half as much as light C and if light C is disconnected then A and B go brighter and if light A goes out then only light C will burn.

Think and compare 1-4 Think and solve 2-5 PAGE 173 Think and Compare 1.All the light bulbs are the same brightness because wire doesn’t give any resistance and the distance from the battery doesn’t matter. 2. The ammeter will read the same current of all the bulbs because the electricity disperses equally over the three parallel light bulbs. 3. Circuit C has the highest current because the current has to provide energy for three bulbs and then Circuit B comes next because there is less energy needed for 2 bulbs and then Circuit A has the least current. 4.a) C – A – B  b) A – B – C   Think and Solve 2. A = V/ W  A=12/8 A=1.5 so the current is correct. 3.??? 4. W = voltage/current W = 120/20 W = 6 so the resistance is 6 W  5. power = Current * Voltage 6 = 0.05 * Voltage 6/0,05 = Voltage 120 = Voltage