Polycrystalline La0.7Ba0.3MnO3 manganite compound with high homogeneity was prepared by the sol-gel method. This compound shows a metal-semiconductor dc resistivity transition at Tms temperature of 300 K. The resistivity shows a dc electric field dependence relation, where, it increases monotonically with the applied dc electric current. In contrast, the Tms is insensitive to the applied electric field, where, it is kept unchanged. The dramatic increase in the dc resistivity with the applied electric current leads to a positive electroresistance that also increases monotonically with the applied electric current. The ac resistivity and the effect of low frequencies are also studied, the results show the monotonic increase in the ac resistivity with increasing the frequency due to the skin effect. The zero frequency (dc) magnetoresistance is enhanced with the frequency increase, where, the magnetoresistance peak shows the values −2.05, −2.9, −4.5 and −4.8% for dc, 3, 70 and 128 Hz, respectively. The dc magnetization measurement shows the ferromagnetic-paramagnetic transition at 300 K revealing the room temperature magnetocaloric properties for the La0.7Ba0.3MnO3 compound. For example, it shows a magnetic entropy change (ΔS) of 1.3 J kg−1 K−1 with a relative cooling power of 41 J kg−1 at 2 T applied magnetic field. In addition, the experimental data of ΔS were modeled by Landau theory that proves the absence of elastic, magnetoelastic and magnetoelectronic coupling effects in the magnetocaloric properties.