Introduction to SAT II Physics

This equation tells us that we can maximize the current by having a large voltage drop and a small resistance. This is one of th ...

Now we can plug the values for the resistivity of copper and the length and cross- sectional area of the wire into the equation ...

If the two variables you know are across from one another, then multiplying them will get you the third. If the two variables yo ...

Circuits Most SAT II Physics questions on circuits will show you a circuit diagram and ask you questions about the current, resi ...

However, each resistor causes a voltage drop, and if there is more than one resistor in the circuit, the sum of the voltage drop ...

simply the product of the current and the resistance. The voltage drop across the two resistors is: Note that the voltage drop a ...

So = 4. WHAT IS THE CURRENT RUNNING THROUGH R1 AND R2? We know that the total voltage drop is 12 V, and since the voltage drop i ...

Determine the equivalent resistance of the resistors in parallel. We’ve already learned to make such calculations. This one is ...

Consider again the circuit whose total resistance we have calculated. What is the current through each resistor? What is the pow ...

Now that we know the current across each resistor, calculating the power dissipated is a straightforward application of the form ...

This circuit consists of resistors in parallel and in series, an arrangement we have looked at before. Following the same two st ...

A fuse burns out if the current in a circuit is too large. This prevents the equipment connected to the circuit from being damag ...

The junction rule deals with “junctions,” where a circuit splits into more than one branch, or when several branches reunite to ...

we drew. If we cross a resistor against the direction of the arrows, the voltage rises by IR. Further, if our loop crosses a bat ...

across the loop. We can express these changes in voltage as an equation, and then substitute in the values we know for , , and : ...

The negative value for the current across means that the current actually flows in the opposite direction of the arrow we drew. ...

capacitance is halved. The proportionality constant between C and A/d is , called the permittivity of free space, which we encou ...

Given = 2 ÂμF, = 6 ÂμF, and = 3 ÂμF, what is the total capacitance of the circuit in the figure above? First, we find the equiva ...

The Greek letter is called the dielectric constant, and it varies from material to material. For all materials, > 1. For a pa ...

in Series Equivalent Capacitanc e of Two Capacitors in Parallel Practice Questions The following choices refer to a circuit cons ...