jameszmills95

A simple Zener diode shunt voltage regulator is to supply 12 V to a load which normally draws a load current which varies from 0 to 50 mA. The input voltage varies between 15 V and 18 V.

1.1 Calculate the maximum rated current value of a Zener device to be used.

1.2 Calculate the minimum power for the Zener that could be used safely.

1.3 If a 5 W rated Zener were to be used, calculate the range of possible RS. values and hence suggest a suitable standard E12 resistor value.

1.4 State four (4) conditions under which a Zener diode dissipates minimum power in a regulator circuit.

I am assigned a homework problem to do, but I am completelylost...I could really use some help please! On the wholething..

Here it is:

Bronfenbrenner Co. uses a standard cost system for its singleproduct in which variable overhead is applied on the basis ofdirect labor hours. The following information is given:

Standard costs per unit:

Raw materials (1.5 grams at $16.00 pergram).......................... $24.00

Direct labor (0.75 hours at $8 perhour)........................................ $6.00

Variable overhead (0.75 hours at $3 perhour)............................ $2.25

Actual experience for current year:

Unitsproduced..................................................................................22,400 units

Purchases of raw materials (21,000 grams at $17 per gram).$357,000

Raw materialsused.........................................................................33,400 grams

Direct labor (16,750 hours at $8 perhour)................................... $134,000

Variable overhead costincurred.....................................................$48,575

Compute the following variances:

a. Direct materials price variance

b. Direct materials quantity variance

c. Direct labor rate variance

d. Direct labor efficiency variance

e. Variable overhead spending variance

f. Variable overhead efficiency variance

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