28/03/2020Current Electricity and Electrical Quantities(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Current Electricity and Electrical Quantities(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What is the unit for voltage? Volts Amperes Ohms Joules2. What is the unit for resistance? Ohms Amperes Joules Volts3. In which direction does electric current flow around a circuit. Negative to Positive Clockwise Anti-clockwise Positive to Negative4. A ____ ____ is related to the force that causes electric charges to flow. Current flow Electric currents Dry cell batteries Voltage difference5. As the electrons flow through the filament, they bump into the metal atoms that make up the filament. In these collisions, some of the electrical energy of the electrons is converted into ______ ______. This is called _______. Resistance, thermal energy Thermal energy, resistance Conductor, resistance Energy, thermal resistance6. We call electrical components hooked up by wires so that electrons can flow from and back to a power source a CIRCUIT False True7. Which of these is the equation for Ohm's Law? R = IV V = IR W = Fd PE = mgh8. Where in an atom are electrons found? On the top of the nucleus but under the protons Near the middle Whizzing around in the space around the nucleus In the nucleus (centre)9. A battery is connected in series with a resistor R. The battery transfers 2000 C of charge completely round the circuit. During this process, 2500J of energy is dissipated in the resistor R and 1500J is dissipated in the battery. The e.m.f of the battery is 0.50 V 2.00 V 0.75 V 1.25 V10. Lead acid batteries provides a voltage difference of ___ volts. 20 12 15 1011. In the Bohr's model of hydrogen atom, the electron moves around the nucleus in circular orbit of radius 5 ⤬ 10–11 m. Its time period is 1.5 ⤬ 10–16 s. The current associated with electron motion is 1.07 ⤬ 10–3 A Zero 1.6 ⤬ 10–19 A 0.17 A12. The resistance of a hotplate is 48 Ω. How much current does the plate carry when connected to a 120-V source? 120 A 5760 A 0.4 A 2.5 A13. If electrons can flow through a substance, we say the material is a conductor. True False14. Current electricity is a type of electricity where electrons move from one place to another through an electric current. True False15. The SI unit for charge is in Ampere Coulomb Current Joules16. A ___________________ is the object that changes electrical energy into light energy. Battery Wire Light bulb17. Which of these materials is an insulator? Rubber Aluminum foil Copper18. Contains two connected plates made of different metals or metallic compounds in a conducting solution. Dry cell battery Wet cell battery Lead-Acid battery19. In this circuit diagram, what are R1, R2, and R3? Resistors connected in series Batteries connected in parallel Batteries connected in series Resistors connected in parallel20. A typical size-D battery has about how many volts? 100 V 0.05 V 1.5 V 9 V21. Current flows as long as there is a closed path that connects one battery terminal to the other battery terminal. False True22. Consider the following two statements (i) Free-electro density is different in different metals. (ii) Free-electro density in a metal depends on temperature. Seebeck effect is caused Neither due to (i) nor due to (ii) Due to both (i) and (ii) Due to (ii) but not due (i) Due to (i) but not due to (ii)23. Electricity is the flow of tiny subatomic particles called.... Electrons Electrodes Ectrons Electrolytes24. A 100 W bulb B1 and two 60 W bulb B2 and B3 are connected to a 250V source as shown in the Figure. Now W1, W2 and W3 are the output powers of the bulbs B1, B2 and B3 respectively. Then W1 < W2 = W3 W1 > W2 = W3 W1 < W2 < W3 W1 > W2 = W325. Charge of 60 C passes through an electric lamp in 2 minutes. Then the current in the lamp is 0.5 A 5A 30 A 1 A26 out of 25Time is Up!