# Algebra

posted by .

Show all steps
The maximum number of volts, E, that can be placed across a resistor is given by the formula E=sq root(PR), where P is the number of watts of piwer that the resistor can absorb and R is the resistance of the resistor in ohms. Solve this equation for R. Use the result to determine the resistance of a resistor if P is 1/2 watts and E is 60 volts.

• Algebra -

E = √PR
E2 = PR

R = E2/P

R = 3600/0.5 = 7200 ohms

## Similar Questions

1. ### Physics

Please check my answers: The voltage across a 10-ohm resistor carrying 3 amps must be?
2. ### Physics

A simple circuit is made of a power source, a rheostat and an ohmic resistor. The potential difference across the resistor is initially 5.0 +/- 0.1 V. A good lab student measures the current across the resistor to be 1.65 +/- 5 mA. …
3. ### College Physics

A simple circuit is made of a power source, a rheostat and an ohmic resistor. The potential difference across the resistor is initially 5.0 ± 0.1 V. A good lab student measures the current across the resistor to be 1.65 ± 5 mA. a)If …
4. ### Physics

Could some one tell m if this is right? 1)Does currend flow through a resistor or across a resistor in a series circuit?
5. ### Physics

A commercial resistor can safely dissipate power only up to a certain rated value. Beyond this value, the resistor becomes excessively hot and often cracks apart. The resistor used in this experiment was rated by the manufacturer to …
6. ### physics

In this current of 12 volts, the voltmeter registers a voltage drop of 4 volts across 1 resistor, what is the voltage drop across the other resistor?
7. ### physics 102

The output voltage of an AC generator is given by Δv = (180 V) sin (70πt). The generator is connected across a 13.0-Ω resistor. (a) By inspection, what is the maximum voltage?
8. ### Physics

12 volts is applied across a 4 ohm resistor. How much power is dissipated by the resistor?
9. ### science

A linear circuit is shown below in Figure 1. Figure 1 The elements in this circuit have the following values: R1=100Ω, R2=200Ω, R3=350Ω, V=5V, and I=0.004A. Determine the potentials drops vA and vB across resistors R1 …
10. ### Physics

I need help. Resistor 1: Watts=? Current=?

More Similar Questions