Could someone help me answer these questions?
1. Water doesn't flow in the pipe when Recall that the rate energy is converted from one form to another is power. (a) both ends are at the same level. Another way of saying this is that water time power = energy converted _ voltage x charge = voltage x Charge = voltage x current In the circuit shown below, Series Circuits 6 V across each 2- resistor. larly, charge will not flow in s conductor if b The unit of power is the wart (or kilowatt). So in units form In the circuit shown at the right, a voltage of 6 V . By Ohm's law, the current in each ends of the conductor are at the same electric RESISTANCE OF potential. But tip the water pipe and increase the Electric power (warts) = current (amperes) x voltage (voltx), pushes charge through a single resistor of 2 SELES IS resistor is (and therefore in the whole circuit) is MAY THE ends of the pipe, as in (b), and water will flow. Simi- where I wart = 1 ampere x ] volt ands ofthe electric potential of one end of an electric conductor so there is a potential . The current through the battery is ifference across the ends. and charge will flow. . THAT'S RIGHT-H. VOLTAGE = ENERGY , SO ENERGY . VOLTAGE . CHARGE... the sum of the currents in the . The units of electric potential difference are AND = CURRENT = NEAT resistors, (volts) (amperes) (ohms) (watts) If a second identical lamp is added, as on the left, the 6-V battery A VOLT IS A UNIT OF LECTRIC ENERGY INTO HEAT must push charge through a total resistance of_ ND AN AMPERE IS A UNIT OF _ AND LIGHT MORE QUICKLY THA Q. The . It is common to call electric potential difference What is the power when a voltage of 120 V drives current in the circuit is then _A 2n Fill In the current In the eight blank spaces In the view of the same (voltage) (amperage) (wattage) a 2-A current through a device? A 25-WATT BULB. THAT'S WHY circuit shown again at the right LAT BULB GLOWS BRIGHTER THAN The flow of electric charge is called electric 25 - WATT BULB ! (voltage) (current) (power), DES VOLTAGE CAUSE CURREN what is the current when a 60-W lamp is connected 3. The equivalent resistance of three 4- resistors in series is and is measured in OR DOES CURRENT CAUSE VOLTAGE (volts) [amperes) (ohms) (watts) IS THE FEFE AND W . Does current flow through a resistor, or across a resistor?_ 3. How much current does a 100-W lamp draw when TORICH DRAWS MORE Cross out the circuit below that is not equivalent to connected to 120 V7 OR THE 25 - WATT BULB ? Is voltage established through a resist the circuit above. Complete the statements: Does current in the lamps occur simultaneously, or does charge flow first through one lamp, then -m a. A current of 1 ampere is a flow of charge at the rate of If part of an electric circuit dissipates energy the other. and finally the last in turn? -coulomb per second hen a charge of 15 C flows through any area in a circuit each second, the current is at 6 W when it draws a current of 3 A, what voltage is impressed across it? m LwL 6. Circuits a and b below are identical with all bulbs rated at equal wattage (therefore equal resis c. One volt is the potential difference . The equation tance). The only difference between the circuits is that Bulb S has a short circuit, as shown. veen two points if 1 joule of energy is needed power - energy converted time WATT'S HAPPENING ? _coulomb of charge between the two points. rearranged gives Consider the parallel circuit at the right . When a lamp is plugged into a 120-V socket, each coulomb of charge that flows in the circuit energy converted = The voltage drop across each resistor is is raised to a potential energy of_ _joules. 6. Explain the difference between a kilowatt and a kilowatt-hour. 2n THE EQUINALEN Which offers more resistance to water flow, a wide now, a wide pipe or a narrow pipe?_ 14.5 v 45 V . The current in each branch is: Similarly, which offers more resistance to the flow of charge, a thick wire or a thin wire? 2-0 resistor PAIR OF RESISTORS Rerefereesor sby start toleave yourmant porch let onall the time. Ifyour fixture contains a a. In which circuit is the current greater?_ in IN PARALLEL IS . In which circuit are all three bulbs equally bright? 2- reslator OMDED BY 1-Q resistor _A THEIR SUM! c. What bulbs are the brightest?_ d. What bulb is the dimmest?_ . The current through the battery equals the sum of the currents which CURRENT . RESISTANCE OR 1 = * e. What bulbs have the largest voltage drops across them? . How much current flows in a 1000-ohm resistor equals -A Which circuit dissipates more power?_ Fill in each blank with the appropriate word. when 1.5 volts are impressed across it? USE OHM'S LAW g. What circuit produces more light? c. The equivalent resistance of the circul THE TRIANGLE 1. Attraction or repulsion of charges depends on their signs, positives or negatives. Attraction or TO FIND THE repulsion of magnets depends on their magnetic_ 2. If the filament resistance in an automobile I * R 's 3 ohms, how many amps does it draw YOU HAVE ALMAGNETIC when connected to a 12-volt battery? COVER THE " LETTER WITH YOUR REMAINING TWO 2. Opposite poles attract; like poles The resistance of the side lights on an automobile FORMULAD are 10 ohms. How much current flows in them 3. A magnetic field is produced by the _ of electric charge. when connected to 12 volts? CONDUCTORS AND RESISTORS HAVE RESISTANCE TO THE 4. Clusters of magnetically aligned atoms are magnetic . What is the current in the 30-ohm heating coll of a CURRENT IN THEM. coffee maker that operates on a 120-volt circuit? 5. A magnetic at-carrying wire. 6. When a current-carrying wire is made to form a coll around a piece of iron, the result is an 5. During a lie detector test, a voltage of 6 V is impressed across two fingers. When a certain question he resistance between the fingers drops more gers drops from 400 000 ohms to 200 000 ohms. What is the current (a) initially through the fingers, and (b) when the resistance betwee tance between them drops? (a) _ _ ( b ) _ A charged particle moving in a magnetic field experiences a deflecting that is maximum when the charge move 5. How much resistance allows an impressed voltage of 6 V to produce a current of 0.006 A? 3. A current-carrying wire experiences a deflecting . What is the resistance of a clothes iron that draws a current that is maximum when the of 12 A at 120 V? wire and magnetic field are_ to one another, OHM MY GOODNESS . What is the voltage across a 100-ohm circuit element that draws a current of 1 A? 9. A simple instrument designed to detect electric current is the when calibrated to measure current, it is an i when calibrated to measure voltage, it is a_ 9. What voltage will produce 3 A through a 15-ohm resistor? REALLY MAKE THE RIGHT-HAND RULE ! 10. The largest size magnet in the world is the CO 10. The current in an incandescent lamp is 0.5 A when connected to a 120-V circuit, and 0.2 A when _itself. connected to a 10-V source. Does the resistance of the lamp change in these cases? answer and defend it with numerical values
