Physics question 'Clear the Runway?

Physics homework help please ;(((((((( Had a 200 question review and just couldnt figure out these! thank you?

• QUESTION 1 Three resistors of resistances 2 Ω, 4 Ω, and 6 Ω are connected in parallel across a 12 V battery. What is the total current in the circuit? 0.75 A 11 A 7.5 A 1.1 A QUESTION 2 Three resistors 1 Ω, 2 Ω and 3 Ω are connected in series with a 6 V battery. What is the potential difference across 3Ω resistor? 1 V 2 V 3 V 6 V QUESTION 3 Three resistors 1 Ω, 2 Ω, and 3 Ω are connected in series with a 6 V battery. What will be the equivalent resistance and current in the circuit? 0.5 Ω; 13 A 0.5 Ω; 1 A 6.0 Ω; 13 A 6.0 Ω; 1 A QUESTION 4 Three resistors 2.5 Ω, 3.5 Ω and 4 Ω are connected in parallel. What is the equivalent resistance? 0.94 Ω 9.4 Ω 1.1 Ω 10 Ω Question 5 When two resistors are connected in parallel, the current in each is the same the voltage across each is the same both must have the same resistance the equivalent resistance equals the sum of two resistances QUESTION 6 A battery of 9 V is connected to a light bulb of resistance 3 Ω by wires through a key. What is the current flow equal to in the circuit when the key is opened and when the key is closed? 0 A; 12 A 0.33 A; 3 A 4.8 A; 0 A 0 A; 3 A QUESTION 7 Three resistors 1 Ω, 2 Ω and 3 Ω are connected in series with a 6 V battery. What is the current in each resistor? 1 A 0.5 A 2 A 3 A QUESTION 8 Several light bulbs each of resistance 1.25 Ω are connected in series across a 115 V power supply. If the current through the circuit is 2 A, what is the number of light bulbs in the circuit? 57 46 115 58 QUESTION 9 A series combination of two resistors of resistance 12 Ω and 8 Ω is connected across a source of emf 24 V. What is the potential difference across 8 Ω resistors? 9.6 V 14.4 V 20 V 24 V QUESTION 10 A filament bulb and a resistor are connected in series to a battery. Which of the following will contribute to the load of the circuit? bulb resistor bulb and resistor none QUESTION 11 Six light bulbs are connected in parallel to a 9 V battery. Each bulb has a resistance of 3 Ω. What is the potential difference across each bulb? 3 V 1.5 V 9 V 9 V QUESTION 12 When a circuit contains little resistance to the flow of charges, it is called: closed circuit dead circuit short circuit open circuit QUESTION 13 A string of decorative lights is connected to a source of emf. In this process, there is conversion of: electrical energy into light energy and heat energy electrical energy into light energy thermal energy into electrical energy light energy into electrical energy QUESTION 14 Two resistors of resistances 6 Ω and 12 Ω are connected in parallel across a 6 V battery. What is the equivalent resistance and total current in the circuit? 4 Ω; 1.5 A 18 Ω; 1.5 A 18 Ω; 0.34 A 4 Ω; 0.7 A QUESTION 15 A radio receiver has an effective resistance of 300 Ω to the input signal on the antenna downlead. The signal voltage is 700 µV. What is the signal current flow in the antenna downlead? 2.3 A 2.3 mA 2.3 µA 23 µA QUESTION 16 A uniform wire of resistance 30 Ω is cut into 4 pieces of equal length and the cut pieces are connected in parallel. What is the equivalent resistance? 7.5 Ω 30 Ω 1.9 Ω 19 Ω

• Answer:

  2), 3) and 7) are the same series circuit and are trivial questions. Total Series Resistance R = 1 + 2 + 3 Ω = 6 Ω Current I = V / R = 6V / 6Ω = 1 Amp V across 3Ω = I*R = 1A*3Ω = 3V Now you do some work ...