First thing you need to do is calculate the Voltage across the 8 ohm resistor. As it is in parallel with the 1 & 3 ohm resistors in series that would be the voltage across those two. P = E^2 / R thus P x R = E^2; 2 watt x 8 ohms = E^2 = 4V Quick check: I = E / R = 4 / 8 = 0.5 A P = E x I = 4 x 0.5 = 2 watts Now Rt = 1 ohm + 3 ohms = 4 ohms Caclulate current in the series circuit: I = E / R = 4V / 4 ohms = 1A Now calaculate the power in the 3 ohm resistor: P = I^2 x R = 1 x 3 = 3 Watts. (NOTE: I am using the ^2 to show exponents, in this case it means squared)
The resistors should be connected in parallel .
When many resistances are connected in series, the equivalent resistance is greater than the greatest single resistance. When many resistances are connected in parallel, the equivalent resistance is less than the smallest single resistance.
Well, the total circuit resistance depends on the type of connection. If the two resistances (or any number of resistances) are connected in series, IE. one resistance end is connected to one end of another resistance, the the circuit total resistance is the sum of the two resistances. say two resistances r1 and r2 are connected in series the total resistance is r1+r2 (in this case its 30 ohms). If the resistances are connected in parallel IE. both the ends of a resistance are connected to both ends of another resistance then the total resistance in this case shall be (r1*r2)/(r1+r2) ,( that is 6.67 ohms in given case).
When connected in series, the overall effective resistance of a bunch of individual resistors is the sum of the individual resistances. It's always more than the resistance of any individual. When connected in parallel, the reciprocal of the overall resistance of a bunch of individual resistors is the sum of the reciprocals of the individual resistances. It's always less than the resistance of any individual. When two resistors are connected in parallel, the overall effective resistance of the pair is (the product of the two individual resistances) divided by (the sum of the two individual resistances). It's always less than the smaller individual resistance.
Two toy electric trains running on the same track are connected in parallel because they both get energized from DC impressed across the two rails they ride on.
If the fans were connected in parallel they would work normally. In series, if the internal resistances of the coils were the same they would split the voltage and operate at half speed.
The resistors should be connected in parallel .
When many resistances are connected in series, the equivalent resistance is greater than the greatest single resistance. When many resistances are connected in parallel, the equivalent resistance is less than the smallest single resistance.
Well, the total circuit resistance depends on the type of connection. If the two resistances (or any number of resistances) are connected in series, IE. one resistance end is connected to one end of another resistance, the the circuit total resistance is the sum of the two resistances. say two resistances r1 and r2 are connected in series the total resistance is r1+r2 (in this case its 30 ohms). If the resistances are connected in parallel IE. both the ends of a resistance are connected to both ends of another resistance then the total resistance in this case shall be (r1*r2)/(r1+r2) ,( that is 6.67 ohms in given case).
Use the formula for parallel resistances: 1/R = 1/R1 + 1/R2. Replace the resistance you know, replacing "x" for the resistance you need to find out: 1/4 = 1/20 + 1/x. Now, just solve this for "x".
When connected in series, the overall effective resistance of a bunch of individual resistors is the sum of the individual resistances. It's always more than the resistance of any individual. When connected in parallel, the reciprocal of the overall resistance of a bunch of individual resistors is the sum of the reciprocals of the individual resistances. It's always less than the resistance of any individual. When two resistors are connected in parallel, the overall effective resistance of the pair is (the product of the two individual resistances) divided by (the sum of the two individual resistances). It's always less than the smaller individual resistance.
A voltmeter is a device to measure the voltage in a electric circuit, and must have be connected in parallel to it.
All residential loads are connected in parallel, so that they share the same supply voltage, which is necessary for them to develop their rated power outputs.
parallel
Three 8.0-W resistors are connected in parallel. What is their equivalent resistance?
The voltage across the resistors will remain constant.
Two toy electric trains running on the same track are connected in parallel because they both get energized from DC impressed across the two rails they ride on.